components/run_command.c

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