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