gnu/usr.bin/patch/pch.c

   1 /* $FreeBSD$
   2  *
   3  * $Log: pch.c,v $
   4  * Revision 2.0.2.0  90/05/01  22:17:51  davison
   5  * patch12u: unidiff support added
   6  *
   7  * Revision 2.0.1.7  88/06/03  15:13:28  lwall
   8  * patch10: Can now find patches in shar scripts.
   9  * patch10: Hunks that swapped and then swapped back could core dump.
  10  *
  11  * Revision 2.0.1.6  87/06/04  16:18:13  lwall
  12  * pch_swap didn't swap p_bfake and p_efake.
  13  *
  14  * Revision 2.0.1.5  87/01/30  22:47:42  lwall
  15  * Improved responses to mangled patches.
  16  *
  17  * Revision 2.0.1.4  87/01/05  16:59:53  lwall
  18  * New-style context diffs caused double call to free().
  19  *
  20  * Revision 2.0.1.3  86/11/14  10:08:33  lwall
  21  * Fixed problem where a long pattern wouldn't grow the hunk.
  22  * Also restored p_input_line when backtracking so error messages are right.
  23  *
  24  * Revision 2.0.1.2  86/11/03  17:49:52  lwall
  25  * New-style delete triggers spurious assertion error.
  26  *
  27  * Revision 2.0.1.1  86/10/29  15:52:08  lwall
  28  * Could falsely report new-style context diff.
  29  *
  30  * Revision 2.0  86/09/17  15:39:37  lwall
  31  * Baseline for netwide release.
  32  *
  33  */
  34
  35 #include "EXTERN.h"
  36 #include "common.h"
  37 #include "util.h"
  38 #include "INTERN.h"
  39 #include "pch.h"
  40
  41 /* Patch (diff listing) abstract type. */
  42
  43 static long p_filesize;                 /* size of the patch file */
  44 static LINENUM p_first;                 /* 1st line number */
  45 static LINENUM p_newfirst;              /* 1st line number of replacement */
  46 static LINENUM p_ptrn_lines;            /* # lines in pattern */
  47 static LINENUM p_repl_lines;            /* # lines in replacement text */
  48 static LINENUM p_end = -1;              /* last line in hunk */
  49 static LINENUM p_max;                   /* max allowed value of p_end */
  50 static LINENUM p_context = 3;           /* # of context lines */
  51 static LINENUM p_input_line = 0;        /* current line # from patch file */
  52 static char **p_line = Null(char**);    /* the text of the hunk */
  53 static short *p_len = Null(short*);     /* length of each line */
  54 static char *p_Char = Nullch;           /* +, -, and ! */
  55 static int hunkmax = INITHUNKMAX;       /* size of above arrays to begin with */
  56 static int p_indent;                    /* indent to patch */
  57 static LINENUM p_base;                  /* where to intuit this time */
  58 static LINENUM p_bline;                 /* line # of p_base */
  59 static LINENUM p_start;                 /* where intuit found a patch */
  60 static LINENUM p_sline;                 /* and the line number for it */
  61 static LINENUM p_hunk_beg;              /* line number of current hunk */
  62 static LINENUM p_efake = -1;            /* end of faked up lines--don't free */
  63 static LINENUM p_bfake = -1;            /* beg of faked up lines */
  64
  65 /*
  66  * Prepare to look for the next patch in the patch file.
  67  */
  68 void
  69 re_patch(void)
  70 {
  71         p_first = Nulline;
  72         p_newfirst = Nulline;
  73         p_ptrn_lines = Nulline;
  74         p_repl_lines = Nulline;
  75         p_end = (LINENUM)-1;
  76         p_max = Nulline;
  77         p_indent = 0;
  78 }
  79
  80 /*
  81  * Open the patch file at the beginning of time.
  82  */
  83 void
  84 open_patch_file(char *filename)
  85 {
  86         if (filename == Nullch || !*filename || strEQ(filename, "-")) {
  87                 pfp = fopen(TMPPATNAME, "w");
  88                 if (pfp == Nullfp)
  89                         pfatal2("can't create %s", TMPPATNAME);
  90                 while (fgets(buf, buf_size, stdin) != Nullch)
  91                         fputs(buf, pfp);
  92                 Fclose(pfp);
  93                 filename = TMPPATNAME;
  94         }
  95         pfp = fopen(filename, "r");
  96         if (pfp == Nullfp)
  97             pfatal2("patch file %s not found", filename);
  98         Fstat(fileno(pfp), &filestat);
  99         p_filesize = filestat.st_size;
 100         next_intuit_at(0L,1L);                  /* start at the beginning */
 101         set_hunkmax();
 102 }
 103
 104 /*
 105  * Make sure our dynamically realloced tables are malloced to begin with.
 106  */
 107 void
 108 set_hunkmax(void)
 109 {
 110 #ifndef lint
 111         if (p_line == Null(char**))
 112                 p_line = (char**) malloc((MEM)hunkmax * sizeof(char *));
 113         if (p_len == Null(short*))
 114                 p_len  = (short*) malloc((MEM)hunkmax * sizeof(short));
 115 #endif
 116         if (p_Char == Nullch)
 117                 p_Char = (char*)  malloc((MEM)hunkmax * sizeof(char));
 118 }
 119
 120 /*
 121  * Enlarge the arrays containing the current hunk of patch.
 122  */
 123 void
 124 grow_hunkmax(void)
 125 {
 126         hunkmax *= 2;
 127         /*
 128          * Note that on most systems, only the p_line array ever gets
 129          * fresh memory since p_len can move into p_line's old space,
 130          * and p_Char can move into p_len's old space.  Not on PDP-11's
 131          * however.  But it doesn't matter.
 132          */
 133         assert(p_line != Null(char**) && p_len != Null(short*) &&
 134             p_Char != Nullch);
 135 #ifndef lint
 136         p_line = (char**) realloc((char*)p_line, (MEM)hunkmax * sizeof(char *));
 137         p_len  = (short*) realloc((char*)p_len,  (MEM)hunkmax * sizeof(short));
 138         p_Char = (char*)  realloc((char*)p_Char, (MEM)hunkmax * sizeof(char));
 139 #endif
 140         if (p_line != Null(char**) && p_len != Null(short*) && p_Char != Nullch)
 141                 return;
 142         if (!using_plan_a)
 143                 fatal1("out of memory\n");
 144         out_of_mem = TRUE;      /* whatever is null will be allocated again */
 145                                 /* from within plan_a(), of all places */
 146 }
 147
 148 /*
 149  * True if the remainder of the patch file contains a diff of some sort.
 150  */
 151 bool
 152 there_is_another_patch(void)
 153 {
 154         if (p_base != 0L && p_base >= p_filesize) {
 155                 if (verbose)
 156                         say1("done\n");
 157                 return FALSE;
 158         }
 159         if (verbose)
 160                 say1("Hmm...");
 161         diff_type = intuit_diff_type();
 162         if (!diff_type) {
 163                 if (p_base != 0L) {
 164                         if (verbose)
 165                                 say1("  Ignoring the trailing garbage.\ndone\n");
 166                 }
 167                 else
 168                         say1("  I can't seem to find a patch in there anywhere.\n");
 169                 return FALSE;
 170         }
 171         if (verbose)
 172                 say3("  %sooks like %s to me...\n",
 173                     (p_base == 0L ? "L" : "The next patch l"),
 174                     diff_type == UNI_DIFF ? "a unified diff" :
 175                     diff_type == CONTEXT_DIFF ? "a context diff" :
 176                     diff_type == NEW_CONTEXT_DIFF ?
 177                     "a new-style context diff" :
 178                     diff_type == NORMAL_DIFF ? "a normal diff" :
 179                     "an ed script" );
 180         if (p_indent && verbose)
 181                 say3("(Patch is indented %d space%s.)\n",
 182                     p_indent, p_indent==1?"":"s");
 183         skip_to(p_start,p_sline);
 184         while (filearg[0] == Nullch) {
 185                 if (force || batch || skip_rest_of_patch) {
 186                         say1("No file to patch.  Skipping...\n");
 187                         filearg[0] = savestr(bestguess);
 188                         skip_rest_of_patch = TRUE;
 189                         return TRUE;
 190                 }
 191                 (void) ask1("File to patch: ");
 192                 if (*buf != '\n') {
 193                         if (bestguess)
 194                                 free(bestguess);
 195                         bestguess = savestr(buf);
 196                         filearg[0] = fetchname(buf, 0, FALSE);
 197                 }
 198                 if (filearg[0] == Nullch) {
 199                         if (ask1("No file found--skip this patch? [n] ")) {
 200                                 if (*buf != 'y') {
 201                                         continue;
 202                                 }
 203                         }
 204                         if (verbose)
 205                                 say1("Skipping patch...\n");
 206                         filearg[0] = fetchname(bestguess, 0, TRUE);
 207                         skip_rest_of_patch = TRUE;
 208                         return TRUE;
 209                 }
 210         }
 211         return TRUE;
 212 }
 213
 214 static char *
 215 p4_savestr(char *str)
 216 {
 217         char *t, *h;
 218
 219         /* Leading whitespace. */
 220         while (isspace((unsigned char)*str))
 221                 str++;
 222
 223         /* Remove the file revision number. */
 224         for (t = str, h = NULL; *t != '\0' && !isspace((unsigned char)*t); t++)
 225                 if (*t == '#')
 226                         h = t;
 227         if (h != NULL)
 228                 *h = '\0';
 229
 230         return savestr(str);
 231 }
 232
 233 /*
 234  * Determine what kind of diff is in the remaining part of the patch file.
 235  */
 236 int
 237 intuit_diff_type(void)
 238 {
 239         Reg4 long this_line = 0;
 240         Reg5 long previous_line;
 241         Reg6 long first_command_line = -1;
 242         long fcl_line;
 243         Reg7 bool last_line_was_command = FALSE;
 244         Reg8 bool this_is_a_command = FALSE;
 245         Reg9 bool stars_last_line = FALSE;
 246         Reg10 bool stars_this_line = FALSE;
 247         Reg3 int indent;
 248         Reg1 char *s;
 249         Reg2 char *t;
 250         char *indtmp = Nullch;
 251         char *oldtmp = Nullch;
 252         char *newtmp = Nullch;
 253         char *indname = Nullch;
 254         char *oldname = Nullch;
 255         char *newname = Nullch;
 256         Reg11 int retval;
 257         bool no_filearg = (filearg[0] == Nullch);
 258         extern int index_first;
 259
 260         ok_to_create_file = FALSE;
 261         Fseek(pfp, p_base, 0);
 262         p_input_line = p_bline - 1;
 263         for (;;) {
 264                 previous_line = this_line;
 265                 last_line_was_command = this_is_a_command;
 266                 stars_last_line = stars_this_line;
 267                 this_line = ftell(pfp);
 268                 indent = 0;
 269                 p_input_line++;
 270                 if (pgets(FALSE) == 0) {
 271                         if (first_command_line >= 0L) {
 272                                 /* nothing but deletes!? */
 273                                 p_start = first_command_line;
 274                                 p_sline = fcl_line;
 275                                 retval = ED_DIFF;
 276                                 goto scan_exit;
 277                         }
 278                         else {
 279                                 p_start = this_line;
 280                                 p_sline = p_input_line;
 281                                 retval = 0;
 282                                 goto scan_exit;
 283                         }
 284                 }
 285                 for (s = buf; *s == ' ' || *s == '\t' || *s == 'X'; s++) {
 286                         if (*s == '\t')
 287                                 indent += 8 - (indent % 8);
 288                         else
 289                                 indent++;
 290                 }
 291                 for (t=s; isdigit((unsigned char)*t) || *t == ','; t++)
 292                         ;
 293                 this_is_a_command = (isdigit((unsigned char)*s) &&
 294                     (*t == 'd' || *t == 'c' || *t == 'a') );
 295                 if (first_command_line < 0L && this_is_a_command) {
 296                         first_command_line = this_line;
 297                         fcl_line = p_input_line;
 298                         p_indent = indent;      /* assume this for now */
 299                 }
 300                 if (!stars_last_line && strnEQ(s, "*** ", 4))
 301                         oldtmp = savestr(s+4);
 302                 else if (strnEQ(s, "--- ", 4))
 303                         newtmp = savestr(s+4);
 304                 else if (strnEQ(s, "+++ ", 4))
 305                         oldtmp = savestr(s+4);  /* pretend it is the old name */
 306                 else if (strnEQ(s, "Index:", 6))
 307                         indtmp = savestr(s+6);
 308                 else if (strnEQ(s, "Prereq:", 7)) {
 309                         for (t = s + 7; isspace((unsigned char)*t); t++)
 310                                 ;
 311                         revision = savestr(t);
 312                         for (t = revision; *t && !isspace((unsigned char)*t);
 313                             t++)
 314                                 ;
 315                         *t = '\0';
 316                         if (!*revision) {
 317                                 free(revision);
 318                                 revision = Nullch;
 319                         }
 320                 } else if (strnEQ(s, "==== ", 5)) {
 321                         /* Perforce-style diffs. */
 322                         if ((t = strstr(s + 5, " - ")) != NULL)
 323                                 newtmp = p4_savestr(t + 3);
 324                         oldtmp = p4_savestr(s + 5);
 325                 }
 326                 if ((!diff_type || diff_type == ED_DIFF) &&
 327                     first_command_line >= 0L &&
 328                     strEQ(s, ".\n") ) {
 329                         p_indent = indent;
 330                         p_start = first_command_line;
 331                         p_sline = fcl_line;
 332                         retval = ED_DIFF;
 333                         goto scan_exit;
 334                 }
 335                 if ((!diff_type || diff_type == UNI_DIFF) &&
 336                     strnEQ(s, "@@ -", 4)) {
 337                         if (!atol(s+3))
 338                                 ok_to_create_file = TRUE;
 339                         p_indent = indent;
 340                         p_start = this_line;
 341                         p_sline = p_input_line;
 342                         retval = UNI_DIFF;
 343                         goto scan_exit;
 344                 }
 345                 stars_this_line = strnEQ(s, "********", 8);
 346                 if ((!diff_type || diff_type == CONTEXT_DIFF) &&
 347                     stars_last_line &&
 348                     strnEQ(s, "*** ", 4)) {
 349                         if (!atol(s+4))
 350                                 ok_to_create_file = TRUE;
 351                         /*
 352                          * If this is a new context diff the character just
 353                          * before the newline is a '*'.
 354                          */
 355                         while (*s != '\n')
 356                                 s++;
 357                         p_indent = indent;
 358                         p_start = previous_line;
 359                         p_sline = p_input_line - 1;
 360                         retval = (*(s-1) == '*' ?
 361                             NEW_CONTEXT_DIFF : CONTEXT_DIFF);
 362                         goto scan_exit;
 363                 }
 364                 if ((!diff_type || diff_type == NORMAL_DIFF) &&
 365                     last_line_was_command &&
 366                     (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2)) ) {
 367                         p_start = previous_line;
 368                         p_sline = p_input_line - 1;
 369                         p_indent = indent;
 370                         retval = NORMAL_DIFF;
 371                         goto scan_exit;
 372                 }
 373         }
 374  scan_exit:
 375         if (no_filearg) {
 376                 if (indtmp != Nullch)
 377                         indname = fetchname(indtmp, strippath,
 378                             ok_to_create_file);
 379                 if (oldtmp != Nullch)
 380                         oldname = fetchname(oldtmp, strippath,
 381                             ok_to_create_file);
 382                 if (newtmp != Nullch)
 383                         newname = fetchname(newtmp, strippath,
 384                             ok_to_create_file);
 385                 if (index_first && indname)
 386                         filearg[0] = savestr(indname);
 387                 else if (oldname && newname) {
 388                         if (strlen(oldname) < strlen(newname))
 389                                 filearg[0] = savestr(oldname);
 390                         else
 391                                 filearg[0] = savestr(newname);
 392                 } else if (indname)
 393                         filearg[0] = savestr(indname);
 394                 else if (oldname)
 395                         filearg[0] = savestr(oldname);
 396                 else if (newname)
 397                         filearg[0] = savestr(newname);
 398         }
 399         if (bestguess) {
 400                 free(bestguess);
 401                 bestguess = Nullch;
 402         }
 403         if (filearg[0] != Nullch)
 404                 bestguess = savestr(filearg[0]);
 405         else if (indtmp != Nullch)
 406                 bestguess = fetchname(indtmp, strippath, TRUE);
 407         else {
 408                 if (oldtmp != Nullch)
 409                         oldname = fetchname(oldtmp, strippath, TRUE);
 410                 if (newtmp != Nullch)
 411                         newname = fetchname(newtmp, strippath, TRUE);
 412                 if (oldname && newname) {
 413                         if (strlen(oldname) < strlen(newname))
 414                                 bestguess = savestr(oldname);
 415                         else
 416                                 bestguess = savestr(newname);
 417                 }
 418                 else if (oldname)
 419                         bestguess = savestr(oldname);
 420                 else if (newname)
 421                         bestguess = savestr(newname);
 422         }
 423         if (indtmp != Nullch)
 424                 free(indtmp);
 425         if (oldtmp != Nullch)
 426                 free(oldtmp);
 427         if (newtmp != Nullch)
 428                 free(newtmp);
 429         if (indname != Nullch)
 430                 free(indname);
 431         if (oldname != Nullch)
 432                 free(oldname);
 433         if (newname != Nullch)
 434                 free(newname);
 435         return retval;
 436 }
 437
 438 /*
 439  * Remember where this patch ends so we know where to start up again.
 440  */
 441 void
 442 next_intuit_at(long file_pos, long file_line)
 443 {
 444         p_base = file_pos;
 445         p_bline = file_line;
 446 }
 447
 448 /*
 449  * Basically a verbose fseek() to the actual diff listing.
 450  */
 451 void
 452 skip_to(long file_pos, long file_line)
 453 {
 454         size_t len;
 455
 456         assert(p_base <= file_pos);
 457         if (verbose && p_base < file_pos) {
 458                 Fseek(pfp, p_base, 0);
 459                 say1("The text leading up to this was:\n--------------------------\n");
 460                 while (ftell(pfp) < file_pos) {
 461                         len = pgets(FALSE);
 462                         assert(len != 0);
 463                         say2("|%s", buf);
 464                 }
 465                 say1("--------------------------\n");
 466         }
 467         else
 468                 Fseek(pfp, file_pos, 0);
 469         p_input_line = file_line - 1;
 470 }
 471
 472 /*
 473  * Make this a function for better debugging.
 474  */
 475 static void
 476 malformed(void)
 477 {
 478         fatal3("malformed patch at line %ld: %s", p_input_line, buf);
 479                 /* about as informative as "Syntax error" in C */
 480 }
 481
 482 /*
 483  * True if the line has been discarded (i.e. it is a line saying
 484  *  "\ No newline at end of file".)
 485  */
 486 static bool
 487 remove_special_line(void)
 488 {
 489         int c;
 490
 491         c = fgetc(pfp);
 492         if (c == '\\') {
 493                 do {
 494                         c = fgetc(pfp);
 495                 } while (c != EOF && c != '\n');
 496
 497                 return TRUE;
 498         }
 499
 500         if (c != EOF)
 501                 fseek(pfp, -1, SEEK_CUR);
 502
 503         return FALSE;
 504 }
 505
 506 /*
 507  * True if there is more of the current diff listing to process.
 508  */
 509 bool
 510 another_hunk(void)
 511 {
 512     Reg1 char *s;
 513     size_t len;
 514     Reg2 int context = 0;
 515
 516     while (p_end >= 0) {
 517         if (p_end == p_efake)
 518             p_end = p_bfake;            /* don't free twice */
 519         else
 520             free(p_line[p_end]);
 521         p_end--;
 522     }
 523     assert(p_end == -1);
 524     p_efake = -1;
 525
 526     p_max = hunkmax;                    /* gets reduced when --- found */
 527     if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) {
 528         long line_beginning = ftell(pfp);
 529                                         /* file pos of the current line */
 530         LINENUM repl_beginning = 0;     /* index of --- line */
 531         Reg4 LINENUM fillcnt = 0;       /* #lines of missing ptrn or repl */
 532         Reg5 LINENUM fillsrc;           /* index of first line to copy */
 533         Reg6 LINENUM filldst;           /* index of first missing line */
 534         bool ptrn_spaces_eaten = FALSE; /* ptrn was slightly misformed */
 535         Reg9 bool repl_could_be_missing = TRUE;
 536                                         /* no + or ! lines in this hunk */
 537         bool repl_missing = FALSE;      /* we are now backtracking */
 538         long repl_backtrack_position = 0;
 539                                         /* file pos of first repl line */
 540         LINENUM repl_patch_line;        /* input line number for same */
 541         Reg7 LINENUM ptrn_copiable = 0;
 542                                         /* # of copiable lines in ptrn */
 543
 544         len = pgets(TRUE);
 545         p_input_line++;
 546         if (len == 0 || strnNE(buf, "********", 8)) {
 547             next_intuit_at(line_beginning,p_input_line);
 548             return FALSE;
 549         }
 550         p_context = 100;
 551         p_hunk_beg = p_input_line + 1;
 552         while (p_end < p_max) {
 553             line_beginning = ftell(pfp);
 554             len = pgets(TRUE);
 555             p_input_line++;
 556             if (len == 0) {
 557                 if (p_max - p_end < 4)
 558                     Strcpy(buf, "  \n");  /* assume blank lines got chopped */
 559                 else {
 560                     if (repl_beginning && repl_could_be_missing) {
 561                         repl_missing = TRUE;
 562                         goto hunk_done;
 563                     }
 564                     fatal1("unexpected end of file in patch\n");
 565                 }
 566             }
 567             p_end++;
 568             assert(p_end < hunkmax);
 569             p_Char[p_end] = *buf;
 570 #ifdef zilog
 571             p_line[(short)p_end] = Nullch;
 572 #else
 573             p_line[p_end] = Nullch;
 574 #endif
 575             switch (*buf) {
 576             case '*':
 577                 if (strnEQ(buf, "********", 8)) {
 578                     if (repl_beginning && repl_could_be_missing) {
 579                         repl_missing = TRUE;
 580                         goto hunk_done;
 581                     }
 582                     else
 583                         fatal2("unexpected end of hunk at line %ld\n",
 584                             p_input_line);
 585                 }
 586                 if (p_end != 0) {
 587                     if (repl_beginning && repl_could_be_missing) {
 588                         repl_missing = TRUE;
 589                         goto hunk_done;
 590                     }
 591                     fatal3("unexpected *** at line %ld: %s", p_input_line, buf);
 592                 }
 593                 context = 0;
 594                 p_line[p_end] = savestr(buf);
 595                 if (out_of_mem) {
 596                     p_end--;
 597                     return FALSE;
 598                 }
 599                 for (s=buf; *s && !isdigit((unsigned char)*s); s++) ;
 600                 if (!*s)
 601                     malformed ();
 602                 if (strnEQ(s,"0,0",3))
 603                     strcpy(s,s+2);
 604                 p_first = (LINENUM) atol(s);
 605                 while (isdigit((unsigned char)*s)) s++;
 606                 if (*s == ',') {
 607                     for (; *s && !isdigit((unsigned char)*s); s++) ;
 608                     if (!*s)
 609                         malformed ();
 610                     p_ptrn_lines = ((LINENUM)atol(s)) - p_first + 1;
 611                 }
 612                 else if (p_first)
 613                     p_ptrn_lines = 1;
 614                 else {
 615                     p_ptrn_lines = 0;
 616                     p_first = 1;
 617                 }
 618                 p_max = p_ptrn_lines + 6;       /* we need this much at least */
 619                 while (p_max >= hunkmax)
 620                     grow_hunkmax();
 621                 p_max = hunkmax;
 622                 break;
 623             case '-':
 624                 if (buf[1] == '-') {
 625                     if (repl_beginning ||
 626                         (p_end != p_ptrn_lines + 1 + (p_Char[p_end-1] == '\n')))
 627                     {
 628                         if (p_end == 1) {
 629                             /* `old' lines were omitted - set up to fill */
 630                             /* them in from 'new' context lines. */
 631                             p_end = p_ptrn_lines + 1;
 632                             fillsrc = p_end + 1;
 633                             filldst = 1;
 634                             fillcnt = p_ptrn_lines;
 635                         }
 636                         else {
 637                             if (repl_beginning) {
 638                                 if (repl_could_be_missing){
 639                                     repl_missing = TRUE;
 640                                     goto hunk_done;
 641                                 }
 642                                 fatal3(
 643 "duplicate \"---\" at line %ld--check line numbers at line %ld\n",
 644                                     p_input_line, p_hunk_beg + repl_beginning);
 645                             }
 646                             else {
 647                                 fatal4(
 648 "%s \"---\" at line %ld--check line numbers at line %ld\n",
 649                                     (p_end <= p_ptrn_lines
 650                                         ? "Premature"
 651                                         : "Overdue" ),
 652                                     p_input_line, p_hunk_beg);
 653                             }
 654                         }
 655                     }
 656                     repl_beginning = p_end;
 657                     repl_backtrack_position = ftell(pfp);
 658                     repl_patch_line = p_input_line;
 659                     p_line[p_end] = savestr(buf);
 660                     if (out_of_mem) {
 661                         p_end--;
 662                         return FALSE;
 663                     }
 664                     p_Char[p_end] = '=';
 665                     for (s=buf; *s && !isdigit((unsigned char)*s); s++) ;
 666                     if (!*s)
 667                         malformed ();
 668                     p_newfirst = (LINENUM) atol(s);
 669                     while (isdigit((unsigned char)*s)) s++;
 670                     if (*s == ',') {
 671                         for (; *s && !isdigit((unsigned char)*s); s++) ;
 672                         if (!*s)
 673                             malformed ();
 674                         p_repl_lines = ((LINENUM)atol(s)) - p_newfirst + 1;
 675                     }
 676                     else if (p_newfirst)
 677                         p_repl_lines = 1;
 678                     else {
 679                         p_repl_lines = 0;
 680                         p_newfirst = 1;
 681                     }
 682                     p_max = p_repl_lines + p_end;
 683                     if (p_max > MAXHUNKSIZE)
 684                         fatal4("hunk too large (%ld lines) at line %ld: %s",
 685                               p_max, p_input_line, buf);
 686                     while (p_max >= hunkmax)
 687                         grow_hunkmax();
 688                     if (p_repl_lines != ptrn_copiable
 689                      && (p_context != 0 || p_repl_lines != 1))
 690                         repl_could_be_missing = FALSE;
 691                     break;
 692                 }
 693                 goto change_line;
 694             case '+':  case '!':
 695                 repl_could_be_missing = FALSE;
 696               change_line:
 697                 if (buf[1] == '\n' && canonicalize)
 698                     strcpy(buf+1," \n");
 699                 if (!isspace((unsigned char)buf[1]) && buf[1] != '>' && buf[1] != '<' &&
 700                   repl_beginning && repl_could_be_missing) {
 701                     repl_missing = TRUE;
 702                     goto hunk_done;
 703                 }
 704                 if (context >= 0) {
 705                     if (context < p_context)
 706                         p_context = context;
 707                     context = -1000;
 708                 }
 709                 p_line[p_end] = savestr(buf+2);
 710                 if (out_of_mem) {
 711                     p_end--;
 712                     return FALSE;
 713                 }
 714                 if (p_end == p_ptrn_lines)
 715                 {
 716                         if (remove_special_line()) {
 717                                 int len;
 718
 719                                 len = strlen(p_line[p_end]) - 1;
 720                                 (p_line[p_end])[len] = 0;
 721                         }
 722                 }
 723                 break;
 724             case '\t': case '\n':       /* assume the 2 spaces got eaten */
 725                 if (repl_beginning && repl_could_be_missing &&
 726                   (!ptrn_spaces_eaten || diff_type == NEW_CONTEXT_DIFF) ) {
 727                     repl_missing = TRUE;
 728                     goto hunk_done;
 729                 }
 730                 p_line[p_end] = savestr(buf);
 731                 if (out_of_mem) {
 732                     p_end--;
 733                     return FALSE;
 734                 }
 735                 if (p_end != p_ptrn_lines + 1) {
 736                     ptrn_spaces_eaten |= (repl_beginning != 0);
 737                     context++;
 738                     if (!repl_beginning)
 739                         ptrn_copiable++;
 740                     p_Char[p_end] = ' ';
 741                 }
 742                 break;
 743             case ' ':
 744                 if (!isspace((unsigned char)buf[1]) &&
 745                   repl_beginning && repl_could_be_missing) {
 746                     repl_missing = TRUE;
 747                     goto hunk_done;
 748                 }
 749                 context++;
 750                 if (!repl_beginning)
 751                     ptrn_copiable++;
 752                 p_line[p_end] = savestr(buf+2);
 753                 if (out_of_mem) {
 754                     p_end--;
 755                     return FALSE;
 756                 }
 757                 break;
 758             default:
 759                 if (repl_beginning && repl_could_be_missing) {
 760                     repl_missing = TRUE;
 761                     goto hunk_done;
 762                 }
 763                 malformed ();
 764             }
 765             /* set up p_len for strncmp() so we don't have to */
 766             /* assume null termination */
 767             if (p_line[p_end])
 768                 p_len[p_end] = strlen(p_line[p_end]);
 769             else
 770                 p_len[p_end] = 0;
 771         }
 772
 773     hunk_done:
 774         if (p_end >=0 && !repl_beginning)
 775             fatal2("no --- found in patch at line %ld\n", pch_hunk_beg());
 776
 777         if (repl_missing) {
 778
 779             /* reset state back to just after --- */
 780             p_input_line = repl_patch_line;
 781             for (p_end--; p_end > repl_beginning; p_end--)
 782                 free(p_line[p_end]);
 783             Fseek(pfp, repl_backtrack_position, 0);
 784
 785             /* redundant 'new' context lines were omitted - set */
 786             /* up to fill them in from the old file context */
 787             if (!p_context && p_repl_lines == 1) {
 788                 p_repl_lines = 0;
 789                 p_max--;
 790             }
 791             fillsrc = 1;
 792             filldst = repl_beginning+1;
 793             fillcnt = p_repl_lines;
 794             p_end = p_max;
 795         }
 796         else if (!p_context && fillcnt == 1) {
 797             /* the first hunk was a null hunk with no context */
 798             /* and we were expecting one line -- fix it up. */
 799             while (filldst < p_end) {
 800                 p_line[filldst] = p_line[filldst+1];
 801                 p_Char[filldst] = p_Char[filldst+1];
 802                 p_len[filldst] = p_len[filldst+1];
 803                 filldst++;
 804             }
 805 #if 0
 806             repl_beginning--;           /* this doesn't need to be fixed */
 807 #endif
 808             p_end--;
 809             p_first++;                  /* do append rather than insert */
 810             fillcnt = 0;
 811             p_ptrn_lines = 0;
 812         }
 813
 814         if (diff_type == CONTEXT_DIFF &&
 815           (fillcnt || (p_first > 1 && ptrn_copiable > 2*p_context)) ) {
 816             if (verbose)
 817                 say4("%s\n%s\n%s\n",
 818 "(Fascinating--this is really a new-style context diff but without",
 819 "the telltale extra asterisks on the *** line that usually indicate",
 820 "the new style...)");
 821             diff_type = NEW_CONTEXT_DIFF;
 822         }
 823
 824         /* if there were omitted context lines, fill them in now */
 825         if (fillcnt) {
 826             p_bfake = filldst;          /* remember where not to free() */
 827             p_efake = filldst + fillcnt - 1;
 828             while (fillcnt-- > 0) {
 829                 while (fillsrc <= p_end && p_Char[fillsrc] != ' ')
 830                     fillsrc++;
 831                 if (fillsrc > p_end)
 832                     fatal2("replacement text or line numbers mangled in hunk at line %ld\n",
 833                         p_hunk_beg);
 834                 p_line[filldst] = p_line[fillsrc];
 835                 p_Char[filldst] = p_Char[fillsrc];
 836                 p_len[filldst] = p_len[fillsrc];
 837                 fillsrc++; filldst++;
 838             }
 839             while (fillsrc <= p_end && fillsrc != repl_beginning &&
 840               p_Char[fillsrc] != ' ')
 841                 fillsrc++;
 842 #ifdef DEBUGGING
 843             if (debug & 64)
 844                 printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n",
 845                     fillsrc,filldst,repl_beginning,p_end+1);
 846 #endif
 847             assert(fillsrc==p_end+1 || fillsrc==repl_beginning);
 848             assert(filldst==p_end+1 || filldst==repl_beginning);
 849         }
 850
 851         if (p_line[p_end] != NULL)
 852         {
 853                 if (remove_special_line()) {
 854                         p_len[p_end] -= 1;
 855                         (p_line[p_end])[p_len[p_end]] = 0;
 856                 }
 857         }
 858     }
 859     else if (diff_type == UNI_DIFF) {
 860         long line_beginning = ftell(pfp);
 861                                         /* file pos of the current line */
 862         Reg4 LINENUM fillsrc;           /* index of old lines */
 863         Reg5 LINENUM filldst;           /* index of new lines */
 864         char ch;
 865
 866         len = pgets(TRUE);
 867         p_input_line++;
 868         if (len == 0 || strnNE(buf, "@@ -", 4)) {
 869             next_intuit_at(line_beginning,p_input_line);
 870             return FALSE;
 871         }
 872         s = buf+4;
 873         if (!*s)
 874             malformed ();
 875         p_first = (LINENUM) atol(s);
 876         while (isdigit((unsigned char)*s)) s++;
 877         if (*s == ',') {
 878             p_ptrn_lines = (LINENUM) atol(++s);
 879             while (isdigit((unsigned char)*s)) s++;
 880         } else
 881             p_ptrn_lines = 1;
 882         if (*s == ' ') s++;
 883         if (*s != '+' || !*++s)
 884             malformed ();
 885         p_newfirst = (LINENUM) atol(s);
 886         while (isdigit((unsigned char)*s)) s++;
 887         if (*s == ',') {
 888             p_repl_lines = (LINENUM) atol(++s);
 889             while (isdigit((unsigned char)*s)) s++;
 890         } else
 891             p_repl_lines = 1;
 892         if (*s == ' ') s++;
 893         if (*s != '@')
 894             malformed ();
 895         if (!p_ptrn_lines)
 896             p_first++;                  /* do append rather than insert */
 897         p_max = p_ptrn_lines + p_repl_lines + 1;
 898         while (p_max >= hunkmax)
 899             grow_hunkmax();
 900         fillsrc = 1;
 901         filldst = fillsrc + p_ptrn_lines;
 902         p_end = filldst + p_repl_lines;
 903         Sprintf(buf,"*** %ld,%ld ****\n",p_first,p_first + p_ptrn_lines - 1);
 904         p_line[0] = savestr(buf);
 905         if (out_of_mem) {
 906             p_end = -1;
 907             return FALSE;
 908         }
 909         p_Char[0] = '*';
 910         Sprintf(buf,"--- %ld,%ld ----\n",p_newfirst,p_newfirst+p_repl_lines-1);
 911         p_line[filldst] = savestr(buf);
 912         if (out_of_mem) {
 913             p_end = 0;
 914             return FALSE;
 915         }
 916         p_Char[filldst++] = '=';
 917         p_context = 100;
 918         context = 0;
 919         p_hunk_beg = p_input_line + 1;
 920         while (fillsrc <= p_ptrn_lines || filldst <= p_end) {
 921             line_beginning = ftell(pfp);
 922             len = pgets(TRUE);
 923             p_input_line++;
 924             if (len == 0) {
 925                 if (p_max - filldst < 3)
 926                     Strcpy(buf, " \n");  /* assume blank lines got chopped */
 927                 else {
 928                     fatal1("unexpected end of file in patch\n");
 929                 }
 930             }
 931             if (*buf == '\t' || *buf == '\n') {
 932                 ch = ' ';               /* assume the space got eaten */
 933                 s = savestr(buf);
 934             }
 935             else {
 936                 ch = *buf;
 937                 s = savestr(buf+1);
 938             }
 939             if (out_of_mem) {
 940                 while (--filldst > p_ptrn_lines)
 941                     free(p_line[filldst]);
 942                 p_end = fillsrc-1;
 943                 return FALSE;
 944             }
 945             switch (ch) {
 946             case '-':
 947                 if (fillsrc > p_ptrn_lines) {
 948                     free(s);
 949                     p_end = filldst-1;
 950                     malformed ();
 951                 }
 952                 p_Char[fillsrc] = ch;
 953                 p_line[fillsrc] = s;
 954                 p_len[fillsrc++] = strlen(s);
 955                 if (fillsrc > p_ptrn_lines) {
 956                         if (remove_special_line()) {
 957                                 p_len[fillsrc - 1] -= 1;
 958                                 s[p_len[fillsrc - 1]] = 0;
 959                         }
 960                 }
 961                 break;
 962             case '=':
 963                 ch = ' ';
 964                 /* FALLTHROUGH */
 965             case ' ':
 966                 if (fillsrc > p_ptrn_lines) {
 967                     free(s);
 968                     while (--filldst > p_ptrn_lines)
 969                         free(p_line[filldst]);
 970                     p_end = fillsrc-1;
 971                     malformed ();
 972                 }
 973                 context++;
 974                 p_Char[fillsrc] = ch;
 975                 p_line[fillsrc] = s;
 976                 p_len[fillsrc++] = strlen(s);
 977                 s = savestr(s);
 978                 if (out_of_mem) {
 979                     while (--filldst > p_ptrn_lines)
 980                         free(p_line[filldst]);
 981                     p_end = fillsrc-1;
 982                     return FALSE;
 983                 }
 984                 /* FALLTHROUGH */
 985             case '+':
 986                 if (filldst > p_end) {
 987                     free(s);
 988                     while (--filldst > p_ptrn_lines)
 989                         free(p_line[filldst]);
 990                     p_end = fillsrc-1;
 991                     malformed ();
 992                 }
 993                 p_Char[filldst] = ch;
 994                 p_line[filldst] = s;
 995                 p_len[filldst++] = strlen(s);
 996                 if (fillsrc > p_ptrn_lines) {
 997                         if (remove_special_line()) {
 998                                 p_len[filldst - 1] -= 1;
 999                                 s[p_len[filldst - 1]] = 0;
1000                         }
1001                 }
1002                 break;
1003             default:
1004                 p_end = filldst;
1005                 malformed ();
1006             }
1007             if (ch != ' ' && context > 0) {
1008                 if (context < p_context)
1009                     p_context = context;
1010                 context = -1000;
1011             }
1012         }/* while */
1013     }
1014     else {                              /* normal diff--fake it up */
1015         char hunk_type;
1016         Reg3 int i;
1017         LINENUM min, max;
1018         long line_beginning = ftell(pfp);
1019
1020         p_context = 0;
1021         len = pgets(TRUE);
1022         p_input_line++;
1023         if (len == 0 || !isdigit((unsigned char)*buf)) {
1024             next_intuit_at(line_beginning,p_input_line);
1025             return FALSE;
1026         }
1027         p_first = (LINENUM)atol(buf);
1028         for (s=buf; isdigit((unsigned char)*s); s++) ;
1029         if (*s == ',') {
1030             p_ptrn_lines = (LINENUM)atol(++s) - p_first + 1;
1031             while (isdigit((unsigned char)*s)) s++;
1032         }
1033         else
1034             p_ptrn_lines = (*s != 'a');
1035         hunk_type = *s;
1036         if (hunk_type == 'a')
1037             p_first++;                  /* do append rather than insert */
1038         min = (LINENUM)atol(++s);
1039         for (; isdigit((unsigned char)*s); s++) ;
1040         if (*s == ',')
1041             max = (LINENUM)atol(++s);
1042         else
1043             max = min;
1044         if (hunk_type == 'd')
1045             min++;
1046         p_end = p_ptrn_lines + 1 + max - min + 1;
1047         if (p_end > MAXHUNKSIZE)
1048             fatal4("hunk too large (%ld lines) at line %ld: %s",
1049                   p_end, p_input_line, buf);
1050         while (p_end >= hunkmax)
1051             grow_hunkmax();
1052         p_newfirst = min;
1053         p_repl_lines = max - min + 1;
1054         Sprintf(buf, "*** %ld,%ld\n", p_first, p_first + p_ptrn_lines - 1);
1055         p_line[0] = savestr(buf);
1056         if (out_of_mem) {
1057             p_end = -1;
1058             return FALSE;
1059         }
1060         p_Char[0] = '*';
1061         for (i=1; i<=p_ptrn_lines; i++) {
1062             len = pgets(TRUE);
1063             p_input_line++;
1064             if (len == 0)
1065                 fatal2("unexpected end of file in patch at line %ld\n",
1066                   p_input_line);
1067             if (*buf != '<')
1068                 fatal2("< expected at line %ld of patch\n", p_input_line);
1069             p_line[i] = savestr(buf+2);
1070             if (out_of_mem) {
1071                 p_end = i-1;
1072                 return FALSE;
1073             }
1074             p_len[i] = strlen(p_line[i]);
1075             p_Char[i] = '-';
1076         }
1077
1078         if (remove_special_line()) {
1079                 p_len[i-1] -= 1;
1080                 (p_line[i-1])[p_len[i-1]] = 0;
1081         }
1082
1083         if (hunk_type == 'c') {
1084             len = pgets(TRUE);
1085             p_input_line++;
1086             if (len == 0)
1087                 fatal2("unexpected end of file in patch at line %ld\n",
1088                     p_input_line);
1089             if (*buf != '-')
1090                 fatal2("--- expected at line %ld of patch\n", p_input_line);
1091         }
1092         Sprintf(buf, "--- %ld,%ld\n", min, max);
1093         p_line[i] = savestr(buf);
1094         if (out_of_mem) {
1095             p_end = i-1;
1096             return FALSE;
1097         }
1098         p_Char[i] = '=';
1099         for (i++; i<=p_end; i++) {
1100             len = pgets(TRUE);
1101             p_input_line++;
1102             if (len == 0)
1103                 fatal2("unexpected end of file in patch at line %ld\n",
1104                     p_input_line);
1105             if (*buf != '>')
1106                 fatal2("> expected at line %ld of patch\n", p_input_line);
1107             p_line[i] = savestr(buf+2);
1108             if (out_of_mem) {
1109                 p_end = i-1;
1110                 return FALSE;
1111             }
1112             p_len[i] = strlen(p_line[i]);
1113             p_Char[i] = '+';
1114         }
1115
1116         if (remove_special_line()) {
1117                 p_len[i-1] -= 1;
1118                 (p_line[i-1])[p_len[i-1]] = 0;
1119         }
1120     }
1121     if (reverse)                        /* backwards patch? */
1122         if (!pch_swap())
1123             say1("Not enough memory to swap next hunk!\n");
1124 #ifdef DEBUGGING
1125     if (debug & 2) {
1126         int i;
1127         char special;
1128
1129         for (i=0; i <= p_end; i++) {
1130             if (i == p_ptrn_lines)
1131                 special = '^';
1132             else
1133                 special = ' ';
1134             fprintf(stderr, "%3d %c %c %s", i, p_Char[i], special, p_line[i]);
1135             Fflush(stderr);
1136         }
1137     }
1138 #endif
1139     if (p_end+1 < hunkmax)      /* paranoia reigns supreme... */
1140         p_Char[p_end+1] = '^';  /* add a stopper for apply_hunk */
1141     return TRUE;
1142 }
1143
1144 /*
1145  * Input a line from the patch file.
1146  * Worry about indentation if do_indent is true.
1147  * The line is read directly into the buf global variable which
1148  * is resized if necessary in order to hold the complete line.
1149  * Returns the number of characters read including the terminating
1150  * '\n', if any.
1151  */
1152 size_t
1153 pgets(bool do_indent)
1154 {
1155         char *line;
1156         size_t len;
1157         int indent = 0, skipped = 0;
1158
1159         line = fgetln(pfp, &len);
1160         if (line != Nullch) {
1161                 if (len + 1 > buf_size) {
1162                         while (len + 1 > buf_size)
1163                                 buf_size *= 2;
1164                         free(buf);
1165                         buf = malloc(buf_size);
1166                         if (buf == Nullch)
1167                                 fatal1("out of memory\n");
1168                 }
1169                 if (do_indent == TRUE && p_indent) {
1170                         for (;
1171                             indent < p_indent && (*line == ' ' || *line == '\t' || *line == 'X');
1172                             line++, skipped++) {
1173                                 if (*line == '\t')
1174                                         indent += 8 - (indent %7);
1175                                 else
1176                                         indent++;
1177                         }
1178                 }
1179                 Strncpy(buf, line, len - skipped);
1180                 buf[len - skipped] = '\0';
1181         }
1182         return len;
1183 }
1184
1185 /*
1186  * Reverse the old and new portions of the current hunk.
1187  */
1188 bool
1189 pch_swap(void)
1190 {
1191         char **tp_line;         /* the text of the hunk */
1192         short *tp_len;          /* length of each line */
1193         char *tp_char;          /* +, -, and ! */
1194         Reg1 LINENUM i;
1195         Reg2 LINENUM n;
1196         bool blankline = FALSE;
1197         Reg3 char *s;
1198
1199         i = p_first;
1200         p_first = p_newfirst;
1201         p_newfirst = i;
1202
1203         /* make a scratch copy */
1204
1205         tp_line = p_line;
1206         tp_len = p_len;
1207         tp_char = p_Char;
1208         p_line = Null(char**);  /* force set_hunkmax to allocate again */
1209         p_len = Null(short*);
1210         p_Char = Nullch;
1211         set_hunkmax();
1212         if (p_line == Null(char**) || p_len == Null(short*) || p_Char == Nullch) {
1213 #ifndef lint
1214                 if (p_line == Null(char**))
1215                         free((char*)p_line);
1216                 p_line = tp_line;
1217                 if (p_len == Null(short*))
1218                         free((char*)p_len);
1219                 p_len = tp_len;
1220 #endif
1221                 if (p_Char == Nullch)
1222                         free((char*)p_Char);
1223                 p_Char = tp_char;
1224                 return FALSE;           /* not enough memory to swap hunk! */
1225         }
1226
1227         /* now turn the new into the old */
1228
1229         i = p_ptrn_lines + 1;
1230         if (tp_char[i] == '\n') {       /* account for possible blank line */
1231                 blankline = TRUE;
1232                 i++;
1233         }
1234         if (p_efake >= 0) {             /* fix non-freeable ptr range */
1235                 if (p_efake <= i)
1236                         n = p_end - i + 1;
1237                 else
1238                         n = -i;
1239                 p_efake += n;
1240                 p_bfake += n;
1241         }
1242         for (n=0; i <= p_end; i++,n++) {
1243                 p_line[n] = tp_line[i];
1244                 p_Char[n] = tp_char[i];
1245                 if (p_Char[n] == '+')
1246                         p_Char[n] = '-';
1247                 p_len[n] = tp_len[i];
1248         }
1249         if (blankline) {
1250                 i = p_ptrn_lines + 1;
1251                 p_line[n] = tp_line[i];
1252                 p_Char[n] = tp_char[i];
1253                 p_len[n] = tp_len[i];
1254                 n++;
1255         }
1256         assert(p_Char[0] == '=');
1257         p_Char[0] = '*';
1258         for (s=p_line[0]; *s; s++)
1259                 if (*s == '-')
1260                         *s = '*';
1261
1262         /* now turn the old into the new */
1263
1264         assert(tp_char[0] == '*');
1265         tp_char[0] = '=';
1266         for (s=tp_line[0]; *s; s++)
1267                 if (*s == '*')
1268                         *s = '-';
1269         for (i=0; n <= p_end; i++,n++) {
1270                 p_line[n] = tp_line[i];
1271                 p_Char[n] = tp_char[i];
1272                 if (p_Char[n] == '-')
1273                         p_Char[n] = '+';
1274                 p_len[n] = tp_len[i];
1275         }
1276         assert(i == p_ptrn_lines + 1);
1277         i = p_ptrn_lines;
1278         p_ptrn_lines = p_repl_lines;
1279         p_repl_lines = i;
1280 #ifndef lint
1281         if (tp_line == Null(char**))
1282                 free((char*)tp_line);
1283         if (tp_len == Null(short*))
1284                 free((char*)tp_len);
1285 #endif
1286         if (tp_char == Nullch)
1287                 free((char*)tp_char);
1288         return TRUE;
1289 }
1290
1291 /*
1292  * Return the specified line position in the old file of the old context.
1293  */
1294 LINENUM
1295 pch_first(void)
1296 {
1297         return p_first;
1298 }
1299
1300 /*
1301  * Return the number of lines of old context.
1302  */
1303 LINENUM
1304 pch_ptrn_lines(void)
1305 {
1306         return p_ptrn_lines;
1307 }
1308
1309 /*
1310  * Return the probable line position in the new file of the first line.
1311  */
1312 LINENUM
1313 pch_newfirst(void)
1314 {
1315         return p_newfirst;
1316 }
1317
1318 /*
1319  * Return the number of lines in the replacement text including context.
1320  */
1321 LINENUM
1322 pch_repl_lines(void)
1323 {
1324         return p_repl_lines;
1325 }
1326
1327 /*
1328  * Return the number of lines in the whole hunk.
1329  */
1330 LINENUM
1331 pch_end(void)
1332 {
1333         return p_end;
1334 }
1335
1336 /*
1337  * Return the number of context lines before the first changed line.
1338  */
1339 LINENUM
1340 pch_context(void)
1341 {
1342         return p_context;
1343 }
1344
1345 /*
1346  * Return the length of a particular patch line.
1347  */
1348 short
1349 pch_line_len(LINENUM line)
1350 {
1351         return p_len[line];
1352 }
1353
1354 /*
1355  * Return the control character (+, -, *, !, etc) for a patch line.
1356  */
1357 char
1358 pch_char(LINENUM line)
1359 {
1360         return p_Char[line];
1361 }
1362
1363 /*
1364  * Return a pointer to a particular patch line.
1365  */
1366 char *
1367 pfetch(LINENUM line)
1368 {
1369         return p_line[line];
1370 }
1371
1372 /*
1373  * Return where in the patch file this hunk began, for error messages.
1374  */
1375 LINENUM
1376 pch_hunk_beg(void)
1377 {
1378         return p_hunk_beg;
1379 }
1380
1381 /*
1382  * Apply an ed script by feeding ed itself.
1383  */
1384 void
1385 do_ed_script(void)
1386 {
1387         Reg1 char *t;
1388         Reg2 long beginning_of_this_line;
1389         Reg3 bool this_line_is_command = FALSE;
1390         Reg4 FILE *pipefp;
1391
1392         if (!skip_rest_of_patch) {
1393                 Unlink(TMPOUTNAME);
1394                 copy_file(filearg[0], TMPOUTNAME);
1395                 if (verbose)
1396                         Sprintf(buf, "/bin/ed %s", TMPOUTNAME);
1397                 else
1398                         Sprintf(buf, "/bin/ed - %s", TMPOUTNAME);
1399                 pipefp = popen(buf, "w");
1400         }
1401         for (;;) {
1402                 beginning_of_this_line = ftell(pfp);
1403                 if (pgets(TRUE) == 0) {
1404                         next_intuit_at(beginning_of_this_line, p_input_line);
1405                         break;
1406                 }
1407                 p_input_line++;
1408                 for (t=buf; isdigit((unsigned char)*t) || *t == ','; t++)
1409                         ;
1410                 this_line_is_command = (isdigit((unsigned char)*buf) &&
1411                     (*t == 'd' || *t == 'c' || *t == 'a') );
1412                 if (this_line_is_command) {
1413                         if (!skip_rest_of_patch)
1414                                 fputs(buf, pipefp);
1415                         if (*t != 'd') {
1416                                 while (pgets(TRUE) != 0) {
1417                                         p_input_line++;
1418                                         if (!skip_rest_of_patch)
1419                                                 fputs(buf, pipefp);
1420                                         if (strEQ(buf, ".\n"))
1421                                                 break;
1422                                 }
1423                         }
1424                 }
1425                 else {
1426                         next_intuit_at(beginning_of_this_line,p_input_line);
1427                         break;
1428                 }
1429         }
1430         if (skip_rest_of_patch)
1431                 return;
1432         fprintf(pipefp, "w\n");
1433         fprintf(pipefp, "q\n");
1434         Fflush(pipefp);
1435         Pclose(pipefp);
1436         ignore_signals();
1437         if (move_file(TMPOUTNAME, outname) < 0) {
1438                 toutkeep = TRUE;
1439                 chmod(TMPOUTNAME, filemode);
1440         }
1441         else
1442                 chmod(outname, filemode);
1443         set_signals(1);
1444 }