run_command.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <err.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         fp = popen(cmd, "r");
  15         if (fp == NULL) {
  16                 warn("Failed to get command output for %s", cmd);
  17                 return NULL;
  18         }
  19         p = fgets(buf, sizeof(buf) - 1, fp);
  20         pclose(fp);
  21         if (!p)
  22                 return NULL;
  23         if ((p = strrchr(buf, '\n')) != NULL)
  24                 p[0] = '\0';
  25
  26         return buf[0] ? buf : NULL;
  27 }