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/* See LICENSE file for copyright and license details. */
#include <arpa/inet.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "util.h"
char *argv0;
static void
verr(const char *fmt, va_list ap)
{
if (argv0 && strncmp(fmt, "usage", sizeof("usage") - 1)) {
fprintf(stderr, "%s: ", argv0);
}
vfprintf(stderr, fmt, ap);
if (fmt[0] && fmt[strlen(fmt) - 1] == ':') {
fputc(' ', stderr);
perror(NULL);
} else {
fputc('\n', stderr);
}
}
void
warn(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
verr(fmt, ap);
va_end(ap);
}
void
die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
verr(fmt, ap);
va_end(ap);
exit(1);
}
void
ff_read_header(uint32_t *width, uint32_t *height)
{
uint32_t hdr[4];
efread(hdr, sizeof(*hdr), LEN(hdr), stdin);
if (memcmp("farbfeld", hdr, sizeof("farbfeld") - 1)) {
die("Invalid magic value");
}
*width = ntohl(hdr[2]);
*height = ntohl(hdr[3]);
}
void
ff_write_header(uint32_t width, uint32_t height)
{
uint32_t tmp;
fputs("farbfeld", stdout);
tmp = htonl(width);
efwrite(&tmp, sizeof(tmp), 1, stdout);
tmp = htonl(height);
efwrite(&tmp, sizeof(tmp), 1, stdout);
}
int
parse_mask(const char *s, uint16_t mask[3])
{
size_t slen, i;
unsigned int col[3], colfac;
char fmt[] = "%#x%#x%#x";
slen = strlen(s);
if (slen != 3 && slen != 6 && slen != 12) {
return 1;
}
fmt[1] = fmt[4] = fmt[7] = ((slen / 3) + '0');
if (sscanf(s, fmt, col, col + 1, col + 2) != 3) {
return 1;
}
colfac = (slen == 3) ? UINT16_MAX / 0xf :
(slen == 6) ? UINT16_MAX / 0xff :
UINT16_MAX / 0xffff;
for (i = 0; i < 3; i++) {
mask[i] = col[i] * colfac;
}
return 0;
}
int
fshut(FILE *fp, const char *fname)
{
int ret = 0;
/* fflush() is undefined for input streams by ISO C,
* but not POSIX 2008 if you ignore ISO C overrides.
* Leave it unchecked and rely on the following
* functions to detect errors.
*/
fflush(fp);
if (ferror(fp) && !ret) {
warn("ferror '%s':", fname);
ret = 1;
}
if (fclose(fp) && !ret) {
warn("fclose '%s':", fname);
ret = 1;
}
return ret;
}
void
efread(void *p, size_t s, size_t n, FILE *f)
{
if (fread(p, s, n, f) != n) {
if (ferror(f)) {
die("fread:");
} else {
die("fread: Unexpected end of file");
}
}
}
void
efwrite(const void *p, size_t s, size_t n, FILE *f)
{
if (fwrite(p, s, n, f) != n) {
die("fwrite:");
}
}
void *
ereallocarray(void *optr, size_t nmemb, size_t size)
{
void *p;
if (!(p = reallocarray(optr, nmemb, size))) {
die("reallocarray: Out of memory");
}
return p;
}
long long
estrtonum(const char *numstr, long long minval, long long maxval)
{
const char *errstr;
long long ll;
ll = strtonum(numstr, minval, maxval, &errstr);
if (errstr) {
die("strtonum '%s': %s", numstr, errstr);
}
return ll;
}
/*
* This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
* if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
*/
#define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4))
void *
reallocarray(void *optr, size_t nmemb, size_t size)
{
if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
nmemb > 0 && SIZE_MAX / nmemb < size) {
errno = ENOMEM;
return NULL;
}
return realloc(optr, size * nmemb);
}
#define INVALID 1
#define TOOSMALL 2
#define TOOLARGE 3
long long
strtonum(const char *numstr, long long minval, long long maxval,
const char **errstrp)
{
long long ll = 0;
int error = 0;
char *ep;
struct errval {
const char *errstr;
int err;
} ev[4] = {
{ NULL, 0 },
{ "invalid", EINVAL },
{ "too small", ERANGE },
{ "too large", ERANGE },
};
ev[0].err = errno;
errno = 0;
if (minval > maxval) {
error = INVALID;
} else {
ll = strtoll(numstr, &ep, 10);
if (numstr == ep || *ep != '\0')
error = INVALID;
else if ((ll == LLONG_MIN && errno == ERANGE) || ll < minval)
error = TOOSMALL;
else if ((ll == LLONG_MAX && errno == ERANGE) || ll > maxval)
error = TOOLARGE;
}
if (errstrp != NULL)
*errstrp = ev[error].errstr;
errno = ev[error].err;
if (error)
ll = 0;
return (ll);
}
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