- /* See LICENSE file for copyright and license details. */
- #include <errno.h>
- #include <stdarg.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.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);
- }
-
- const char *
- bprintf(const char *fmt, ...)
- {
- va_list ap;
- int ret;
-
- va_start(ap, fmt);
- if ((ret = vsnprintf(buf, sizeof(buf), fmt, ap)) < 0) {
- warn("vsnprintf:");
- } else if ((size_t)ret >= sizeof(buf)) {
- warn("vsnprintf: Output truncated");
- }
- va_end(ap);
-
- return buf;
- }
-
- int
- pscanf(const char *path, const char *fmt, ...)
- {
- FILE *fp;
- va_list ap;
- int n;
-
- if (!(fp = fopen(path, "r"))) {
- warn("fopen '%s':", path);
- return -1;
- }
- va_start(ap, fmt);
- n = vfscanf(fp, fmt, ap);
- va_end(ap);
- fclose(fp);
-
- return (n == EOF) ? -1 : n;
- }
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