util.c

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