diff options
author | pommicket <pommicket@gmail.com> | 2022-02-20 13:18:21 -0800 |
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committer | pommicket <pommicket@gmail.com> | 2022-02-20 13:18:21 -0800 |
commit | 9bc8a11afeed3569736b89754012e3ca22ee10f6 (patch) | |
tree | 5f0ec0d5c05f879b1ee86adfa654ed3ef2178d5f /05/musl-0.6.0/src/misc/getopt.c | |
parent | 0f97a589b800bdb71dda05984192f0f66a52edaa (diff) |
conclusion
Diffstat (limited to '05/musl-0.6.0/src/misc/getopt.c')
-rw-r--r-- | 05/musl-0.6.0/src/misc/getopt.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/05/musl-0.6.0/src/misc/getopt.c b/05/musl-0.6.0/src/misc/getopt.c new file mode 100644 index 0000000..abf0e84 --- /dev/null +++ b/05/musl-0.6.0/src/misc/getopt.c @@ -0,0 +1,63 @@ +#include <unistd.h> +#include <wchar.h> +#include <string.h> +#include <limits.h> +#include <stdlib.h> + +char *optarg; +int optind=1, opterr=1, optopt; +static int optpos; + +int getopt(int argc, char * const argv[], const char *optstring) +{ + int i; + wchar_t c, d; + int k, l; + char *optchar; + + if (optind >= argc || !argv[optind] || argv[optind][0] != '-' || !argv[optind][1]) + return -1; + if (argv[optind][1] == '-' && !argv[optind][2]) + return optind++, -1; + + if (!optpos) optpos++; + if ((k = mbtowc(&c, argv[optind]+optpos, MB_LEN_MAX)) < 0) { + k = 1; + c = 0xfffd; /* replacement char */ + } + optchar = argv[optind]+optpos; + optopt = c; + optpos += k; + + if (!argv[optind][optpos]) { + optind++; + optpos = 0; + } + + for (i=0; (l = mbtowc(&d, optstring+i, MB_LEN_MAX)) && d!=c; i+=l>0?l:1); + + if (d != c) { + if (optstring[0] != ':' && opterr) { + write(2, argv[0], strlen(argv[0])); + write(2, ": illegal option: ", 18); + write(2, optchar, k); + write(2, "\n", 1); + } + return '?'; + } + if (optstring[i+1] == ':') { + if (optind >= argc) { + if (optstring[0] == ':') return ':'; + if (opterr) { + write(2, argv[0], strlen(argv[0])); + write(2, ": option requires an argument: ", 31); + write(2, optchar, k); + write(2, "\n", 1); + } + return '?'; + } + optarg = argv[optind++] + optpos; + optpos = 0; + } + return c; +} |