[hackers] [sbase] Implement XSI extensions -signal_name and -signal_number for kill(1) || sin

[git]

commit a0e90509254c7a8db5f7ff55560f2a8ff37c32d4
Author: sin <s...@2f30.org>
Date:   Tue Nov 11 15:35:27 2014 +0000

    Implement XSI extensions -signal_name and -signal_number for kill(1)

diff --git a/kill.c b/kill.c
index f66c84d..7f30fe4 100644
--- a/kill.c
+++ b/kill.c
@@ -1,5 +1,6 @@
 /* See LICENSE file for copyright and license details. */
 #include <sys/wait.h>
+#include <ctype.h>
 #include <errno.h>
 #include <signal.h>
 #include <stdbool.h>
@@ -47,7 +48,25 @@ main(int argc, char *argv[])
 
        argc--;
        argv++;
-       if (strcmp(argv[0], "-l") == 0) {
+       if (strcmp(argv[0], "--") == 0) {
+               argc--;
+               argv++;
+               if (argc == 0)
+                       usage();
+       } else if (argv[0][0] == '-' && isdigit(argv[0][1])) {
+               /* handle XSI extension -signal_number */
+               errno = 0;
+               sig = strtol(&argv[0][1], &end, 0);
+               if (*end != '\0' || errno != 0)
+                       eprintf("%d: bad signal number\n", sig);
+               for (i = 0; i < LEN(sigs); i++)
+                       if (sigs[i].sig == sig || sig == 0)
+                               break;
+               if (i == LEN(sigs))
+                       eprintf("%d: bad signal number\n", sig);
+               argc--;
+               argv++;
+       } else if (strcmp(argv[0], "-l") == 0) {
                argc--;
                argv++;
                if (argc == 0) {
@@ -70,30 +89,31 @@ main(int argc, char *argv[])
                        }
                }
                exit(0);
-       } else if (strcmp(argv[0], "-s") == 0) {
-               argc--;
-               argv++;
-               if (argc == 0)
-                       usage();
-               if (strcmp(argv[0], "0") == 0) {
+       } else {
+               if (strcmp(argv[0], "-s") == 0) {
+                       argc--;
+                       argv++;
+                       if (argc == 0)
+                               usage();
+                       name = argv[0];
+               } else {
+                       /* assume XSI extension -signal_name */
+                       name = &argv[0][1];
+               }
+               if (strcmp(name, "0") == 0) {
                        sig = 0;
                } else {
                        for (i = 0; i < LEN(sigs); i++) {
-                               if (strcasecmp(sigs[i].name, argv[0]) == 0) {
+                               if (strcasecmp(sigs[i].name, name) == 0) {
                                        sig = sigs[i].sig;
                                        break;
                                }
                        }
                        if (i == LEN(sigs))
-                               eprintf("%s: bad signal number\n", argv[0]);
+                               eprintf("%s: bad signal number\n", name);
                }
                argc--;
                argv++;
-       } else if (strcmp(argv[0], "--") == 0) {
-               argc--;
-               argv++;
-               if (argc == 0)
-                       usage();
        }
 
        if (argc == 0)