diff options
| -rw-r--r-- | xbacklight.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/xbacklight.c b/xbacklight.c index 1d6d987..b7c8011 100644 --- a/xbacklight.c +++ b/xbacklight.c @@ -26,6 +26,7 @@ #include <stdio.h> #include <stdlib.h> +#include <errno.h> #include <xcb/xcb.h> #include <xcb/xcb_util.h> @@ -59,6 +60,16 @@ usage (int exitcode) exit (exitcode); } +static double +atof_or_die (char *str) +{ + double retval; + errno = 0; + retval = strtod(str, NULL); + if (errno) usage(1); + return retval; +} + static void missing_arg (const char *option) { @@ -150,39 +161,39 @@ main (int argc, char **argv) { if (++i >= argc) missing_arg (argv[i-1]); op = Set; - value = atof (argv[i]); + value = atof_or_die (argv[i]); continue; } if (argv[i][0] == '=' && isdigit (argv[i][1])) { op = Set; - value = atof (argv[i] + 1); + value = atof_or_die (argv[i] + 1); continue; } if (!strcmp (argv[i], "-inc") || !strcmp (argv[i], "+")) { if (++i >= argc) missing_arg (argv[i-1]); op = Inc; - value = atof (argv[i]); + value = atof_or_die (argv[i]); continue; } if (argv[i][0] == '+' && isdigit (argv[i][1])) { op = Inc; - value = atof (argv[i] + 1); + value = atof_or_die (argv[i] + 1); continue; } if (!strcmp (argv[i], "-dec") || !strcmp (argv[i], "-")) { if (++i >= argc) missing_arg (argv[i-1]); op = Dec; - value = atof (argv[i]); + value = atof_or_die (argv[i]); continue; } if (argv[i][0] == '-' && isdigit (argv[i][1])) { op = Dec; - value = atof (argv[i] + 1); + value = atof_or_die (argv[i] + 1); continue; } if (!strcmp (argv[i], "-get") || !strcmp (argv[i], "-g")) |