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///////////////////////////////////////////////////////////////////////////////
//
/// \file util.c
/// \brief Miscellaneous utility functions
//
// Author: Lasse Collin
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#include "private.h"
// Thousand separator for format strings is not supported outside POSIX.
// This is used in uint64_to_str() and double_to_str().
#ifdef DOSLIKE
# define THOUSAND ""
#else
# define THOUSAND "'"
#endif
extern void *
xrealloc(void *ptr, size_t size)
{
assert(size > 0);
ptr = realloc(ptr, size);
if (ptr == NULL)
message_fatal("%s", strerror(errno));
return ptr;
}
extern char *
xstrdup(const char *src)
{
assert(src != NULL);
const size_t size = strlen(src) + 1;
char *dest = xmalloc(size);
return memcpy(dest, src, size);
}
extern uint64_t
str_to_uint64(const char *name, const char *value, uint64_t min, uint64_t max)
{
uint64_t result = 0;
// Skip blanks.
while (*value == ' ' || *value == '\t')
++value;
// Accept special value "max". Supporting "min" doesn't seem useful.
if (strcmp(value, "max") == 0)
return max;
if (*value < '0' || *value > '9')
message_fatal(_("%s: Value is not a non-negative "
"decimal integer"), value);
do {
// Don't overflow.
if (result > (UINT64_MAX - 9) / 10)
goto error;
result *= 10;
result += *value - '0';
++value;
} while (*value >= '0' && *value <= '9');
if (*value != '\0') {
// Look for suffix.
static const struct {
const char name[4];
uint64_t multiplier;
} suffixes[] = {
{ "k", UINT64_C(1000) },
{ "kB", UINT64_C(1000) },
{ "M", UINT64_C(1000000) },
{ "MB", UINT64_C(1000000) },
{ "G", UINT64_C(1000000000) },
{ "GB", UINT64_C(1000000000) },
{ "Ki", UINT64_C(1024) },
{ "KiB", UINT64_C(1024) },
{ "Mi", UINT64_C(1048576) },
{ "MiB", UINT64_C(1048576) },
{ "Gi", UINT64_C(1073741824) },
{ "GiB", UINT64_C(1073741824) }
};
uint64_t multiplier = 0;
for (size_t i = 0; i < ARRAY_SIZE(suffixes); ++i) {
if (strcmp(value, suffixes[i].name) == 0) {
multiplier = suffixes[i].multiplier;
break;
}
}
if (multiplier == 0) {
message(V_ERROR, _("%s: Invalid multiplier suffix. "
"Valid suffixes:"), value);
message_fatal("`k' (10^3), `M' (10^6), `G' (10^9) "
"`Ki' (2^10), `Mi' (2^20), "
"`Gi' (2^30)");
}
// Don't overflow here either.
if (result > UINT64_MAX / multiplier)
goto error;
result *= multiplier;
}
if (result < min || result > max)
goto error;
return result;
error:
message_fatal(_("Value of the option `%s' must be in the range "
"[%" PRIu64 ", %" PRIu64 "]"),
name, min, max);
}
extern const char *
uint64_to_str(uint64_t value, uint32_t slot)
{
// 2^64 with thousand separators is 26 bytes plus trailing '\0'.
static char bufs[4][32];
assert(slot < ARRAY_SIZE(bufs));
snprintf(bufs[slot], sizeof(bufs[slot]), "%" THOUSAND PRIu64, value);
return bufs[slot];
}
extern const char *
double_to_str(double value)
{
// 64 bytes is surely enough, since it won't fit in some other
// fields anyway.
static char buf[64];
snprintf(buf, sizeof(buf), "%" THOUSAND ".1f", value);
return buf;
}
/*
/// \brief Simple quoting to get rid of ASCII control characters
///
/// This is not so cool and locale-dependent, but should be good enough
/// At least we don't print any control characters on the terminal.
///
extern char *
str_quote(const char *str)
{
size_t dest_len = 0;
bool has_ctrl = false;
while (str[dest_len] != '\0')
if (*(unsigned char *)(str + dest_len++) < 0x20)
has_ctrl = true;
char *dest = malloc(dest_len + 1);
if (dest != NULL) {
if (has_ctrl) {
for (size_t i = 0; i < dest_len; ++i)
if (*(unsigned char *)(str + i) < 0x20)
dest[i] = '?';
else
dest[i] = str[i];
dest[dest_len] = '\0';
} else {
// Usually there are no control characters,
// so we can optimize.
memcpy(dest, str, dest_len + 1);
}
}
return dest;
}
*/
extern bool
is_empty_filename(const char *filename)
{
if (filename[0] == '\0') {
message_error(_("Empty filename, skipping"));
return true;
}
return false;
}
extern bool
is_tty_stdin(void)
{
const bool ret = isatty(STDIN_FILENO);
if (ret)
message_error(_("Compressed data not read from a terminal "
"unless `--force' is used."));
return ret;
}
extern bool
is_tty_stdout(void)
{
const bool ret = isatty(STDOUT_FILENO);
if (ret)
message_error(_("Compressed data not written to a terminal "
"unless `--force' is used."));
return ret;
}
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