1 ///////////////////////////////////////////////////////////////////////////////
4 /// \brief Miscellaneous utility functions
6 // Author: Lasse Collin
8 // This file has been put into the public domain.
9 // You can do whatever you want with this file.
11 ///////////////////////////////////////////////////////////////////////////////
17 /// Buffers for uint64_to_str() and uint64_to_nicestr()
18 static char bufs[4][128];
20 /// Thousand separator support in uint64_to_str() and uint64_to_nicestr()
21 static enum { UNKNOWN, WORKS, BROKEN } thousand = UNKNOWN;
25 xrealloc(void *ptr, size_t size)
29 // Save ptr so that we can free it if realloc fails.
30 // The point is that message_fatal ends up calling stdio functions
31 // which in some libc implementations might allocate memory from
32 // the heap. Freeing ptr improves the chances that there's free
33 // memory for stdio functions if they need it.
35 ptr = realloc(ptr, size);
38 const int saved_errno = errno;
40 message_fatal("%s", strerror(saved_errno));
48 xstrdup(const char *src)
51 const size_t size = strlen(src) + 1;
52 char *dest = xmalloc(size);
53 return memcpy(dest, src, size);
58 str_to_uint64(const char *name, const char *value, uint64_t min, uint64_t max)
63 while (*value == ' ' || *value == '\t')
66 // Accept special value "max". Supporting "min" doesn't seem useful.
67 if (strcmp(value, "max") == 0)
70 if (*value < '0' || *value > '9')
71 message_fatal(_("%s: Value is not a non-negative "
72 "decimal integer"), value);
76 if (result > UINT64_MAX / 10)
81 // Another overflow check
82 const uint32_t add = *value - '0';
83 if (UINT64_MAX - add < result)
88 } while (*value >= '0' && *value <= '9');
91 // Look for suffix. Originally this supported both base-2
92 // and base-10, but since there seems to be little need
93 // for base-10 in this program, treat everything as base-2
94 // and also be more relaxed about the case of the first
95 // letter of the suffix.
96 uint64_t multiplier = 0;
97 if (*value == 'k' || *value == 'K')
98 multiplier = UINT64_C(1) << 10;
99 else if (*value == 'm' || *value == 'M')
100 multiplier = UINT64_C(1) << 20;
101 else if (*value == 'g' || *value == 'G')
102 multiplier = UINT64_C(1) << 30;
106 // Allow also e.g. Ki, KiB, and KB.
107 if (*value != '\0' && strcmp(value, "i") != 0
108 && strcmp(value, "iB") != 0
109 && strcmp(value, "B") != 0)
112 if (multiplier == 0) {
113 message(V_ERROR, _("%s: Invalid multiplier suffix"),
115 message_fatal(_("Valid suffixes are `KiB' (2^10), "
116 "`MiB' (2^20), and `GiB' (2^30)."));
119 // Don't overflow here either.
120 if (result > UINT64_MAX / multiplier)
123 result *= multiplier;
126 if (result < min || result > max)
132 message_fatal(_("Value of the option `%s' must be in the range "
133 "[%" PRIu64 ", %" PRIu64 "]"),
139 round_up_to_mib(uint64_t n)
141 return (n >> 20) + ((n & ((UINT32_C(1) << 20) - 1)) != 0);
145 /// Check if thousand separator is supported. Run-time checking is easiest,
146 /// because it seems to be sometimes lacking even on POSIXish system.
148 check_thousand_sep(uint32_t slot)
150 if (thousand == UNKNOWN) {
151 bufs[slot][0] = '\0';
152 snprintf(bufs[slot], sizeof(bufs[slot]), "%'u", 1U);
153 thousand = bufs[slot][0] == '1' ? WORKS : BROKEN;
161 uint64_to_str(uint64_t value, uint32_t slot)
163 assert(slot < ARRAY_SIZE(bufs));
165 check_thousand_sep(slot);
167 if (thousand == WORKS)
168 snprintf(bufs[slot], sizeof(bufs[slot]), "%'" PRIu64, value);
170 snprintf(bufs[slot], sizeof(bufs[slot]), "%" PRIu64, value);
177 uint64_to_nicestr(uint64_t value, enum nicestr_unit unit_min,
178 enum nicestr_unit unit_max, bool always_also_bytes,
181 assert(unit_min <= unit_max);
182 assert(unit_max <= NICESTR_TIB);
183 assert(slot < ARRAY_SIZE(bufs));
185 check_thousand_sep(slot);
187 enum nicestr_unit unit = NICESTR_B;
188 char *pos = bufs[slot];
189 size_t left = sizeof(bufs[slot]);
191 if ((unit_min == NICESTR_B && value < 10000)
192 || unit_max == NICESTR_B) {
193 // The value is shown as bytes.
194 if (thousand == WORKS)
195 my_snprintf(&pos, &left, "%'u", (unsigned int)value);
197 my_snprintf(&pos, &left, "%u", (unsigned int)value);
199 // Scale the value to a nicer unit. Unless unit_min and
200 // unit_max limit us, we will show at most five significant
201 // digits with one decimal place.
202 double d = (double)(value);
206 } while (unit < unit_min || (d > 9999.9 && unit < unit_max));
208 if (thousand == WORKS)
209 my_snprintf(&pos, &left, "%'.1f", d);
211 my_snprintf(&pos, &left, "%.1f", d);
214 static const char suffix[5][4] = { "B", "KiB", "MiB", "GiB", "TiB" };
215 my_snprintf(&pos, &left, " %s", suffix[unit]);
217 if (always_also_bytes && value >= 10000) {
218 if (thousand == WORKS)
219 snprintf(pos, left, " (%'" PRIu64 " B)", value);
221 snprintf(pos, left, " (%" PRIu64 " B)", value);
229 my_snprintf(char **pos, size_t *left, const char *fmt, ...)
233 const int len = vsnprintf(*pos, *left, fmt, ap);
236 // If an error occurred, we want the caller to think that the whole
237 // buffer was used. This way no more data will be written to the
238 // buffer. We don't need better error handling here, although it
239 // is possible that the result looks garbage on the terminal if
240 // e.g. an UTF-8 character gets split. That shouldn't (easily)
241 // happen though, because the buffers used have some extra room.
242 if (len < 0 || (size_t)(len) >= *left) {
254 is_empty_filename(const char *filename)
256 if (filename[0] == '\0') {
257 message_error(_("Empty filename, skipping"));
268 const bool ret = isatty(STDIN_FILENO);
271 message_error(_("Compressed data cannot be read from "
281 const bool ret = isatty(STDOUT_FILENO);
284 message_error(_("Compressed data cannot be written to "