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authorRich Felker <dalias@aerifal.cx>2014-12-20 19:44:37 -0500
committerRich Felker <dalias@aerifal.cx>2014-12-20 19:44:37 -0500
commit91184c4f16b143107fa9935edebe5d2b20bd70d8 (patch)
tree6f74e3f852498ae639bcc6250e53620f062ad5e4 /src/misc/getopt_long.c
parentd3357268791f5279b64665a9a5b5629c962c8a15 (diff)
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add error message printing to getopt_long and make related improvements
some related changes are also made to getopt, and the return value of getopt_long in the case of missing arguments is fixed.
Diffstat (limited to 'src/misc/getopt_long.c')
-rw-r--r--src/misc/getopt_long.c34
1 files changed, 30 insertions, 4 deletions
diff --git a/src/misc/getopt_long.c b/src/misc/getopt_long.c
index df2083bb..45992f85 100644
--- a/src/misc/getopt_long.c
+++ b/src/misc/getopt_long.c
@@ -2,6 +2,7 @@
#include <stddef.h>
#include <getopt.h>
#include <stdio.h>
+#include <string.h>
extern int __optpos, __optreset;
@@ -15,11 +16,14 @@ static void permute(char *const *argv, int dest, int src)
av[dest] = tmp;
}
+void __getopt_msg(const char *, const char *, const char *, size_t);
+
static int __getopt_long_core(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly);
static int __getopt_long(int argc, char *const *argv, const char *optstring, const struct option *longopts, int *idx, int longonly)
{
int ret, skipped, resumed;
+ const char *optstring2 = optstring + 1;
if (!optind || __optreset) {
__optreset = 0;
__optpos = 0;
@@ -34,9 +38,10 @@ static int __getopt_long(int argc, char *const *argv, const char *optstring, con
if (argv[i][0] == '-' && argv[i][1]) break;
}
optind = i;
+ optstring2 = optstring;
}
resumed = optind;
- ret = __getopt_long_core(argc, argv, optstring, longopts, idx, longonly);
+ ret = __getopt_long_core(argc, argv, optstring2, longopts, idx, longonly);
if (resumed > skipped) {
int i, cnt = optind-resumed;
for (i=0; i<cnt; i++)
@@ -72,12 +77,27 @@ static int __getopt_long_core(int argc, char *const *argv, const char *optstring
i = match;
optind++;
if (*opt == '=') {
- if (!longopts[i].has_arg) return '?';
+ if (!longopts[i].has_arg) {
+ if (optstring[0] == ':' || !opterr)
+ return '?';
+ __getopt_msg(argv[0],
+ ": option does not take an argument: ",
+ longopts[i].name,
+ strlen(longopts[i].name));
+ return '?';
+ }
optarg = opt+1;
} else {
if (longopts[i].has_arg == required_argument) {
- if (!(optarg = argv[optind]))
- return ':';
+ if (!(optarg = argv[optind])) {
+ if (optstring[0] == ':' || !opterr)
+ return ':';
+ __getopt_msg(argv[0],
+ ": option requires an argument: ",
+ longopts[i].name,
+ strlen(longopts[i].name));
+ return '?';
+ }
optind++;
} else optarg = NULL;
}
@@ -89,6 +109,12 @@ static int __getopt_long_core(int argc, char *const *argv, const char *optstring
return longopts[i].val;
}
if (argv[optind][1] == '-') {
+ if (optstring[0] != ':' && opterr)
+ __getopt_msg(argv[0], cnt ?
+ ": option is ambiguous: " :
+ ": unrecognized option: ",
+ argv[optind]+2,
+ strlen(argv[optind]+2));
optind++;
return '?';
}