components/run_command.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 #include "../util.h"
   7
   8 const char *
   9 run_command(const char *cmd)
  10 {
  11         char *p;
  12         FILE *fp;
  13
  14         if (!(fp = popen(cmd, "r"))) {
  15                 warn("popen '%s':", cmd);
  16                 return NULL;
  17         }
  18         p = fgets(buf, sizeof(buf) - 1, fp);
  19         if (pclose(fp) < 0) {
  20                 warn("pclose '%s':", cmd);
  21                 return NULL;
  22         }
  23         if (!p) {
  24                 return NULL;
  25         }
  26         if ((p = strrchr(buf, '\n'))) {
  27                 p[0] = '\0';
  28         }
  29
  30         return buf[0] ? buf : NULL;
  31 }