util.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <err.h>
   3 #include <errno.h>
   4 #include <stdarg.h>
   5 #include <stdio.h>
   6 #include <string.h>
   7
   8 #include "util.h"
   9
  10 const char *
  11 bprintf(const char *fmt, ...)
  12 {
  13         va_list ap;
  14         size_t len;
  15
  16         va_start(ap, fmt);
  17         len = vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
  18         va_end(ap);
  19
  20         if (len >= sizeof(buf))
  21                 buf[sizeof(buf)-1] = '\0';
  22
  23         return buf;
  24 }
  25
  26 int
  27 pscanf(const char *path, const char *fmt, ...)
  28 {
  29         FILE *fp;
  30         va_list ap;
  31         int n;
  32
  33         if (!(fp = fopen(path, "r"))) {
  34                 warn("fopen %s: %s\n", path, strerror(errno));
  35                 return -1;
  36         }
  37         va_start(ap, fmt);
  38         n = vfscanf(fp, fmt, ap);
  39         va_end(ap);
  40         fclose(fp);
  41
  42         return (n == EOF) ? -1 : n;
  43 }