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// Copyright (C) 2020, Jakob Wakeling |
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// MIT Licence |
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#include "optget.h" |
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#include <stddef.h> |
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#include <stdio.h> |
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#include <string.h> |
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#define cur av[opt->ind] |
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const struct opt OPTGET_INIT = { 1, 0, 1, 0, NULL, NULL, NULL, NULL }; |
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static inline void permute(char **av, int i, int n); |
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int optget(struct opt *opt, char *av[], int flags) { |
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if (flags & 1) { |
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for (; cur && (cur[0] != '-' || cur[1] == 0); ++opt->ind, ++opt->nop); |
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if (!cur) { opt->ind -= opt->nop; opt->nop = 0; return -1; } |
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} |
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else if (!cur || (cur[0] != '-' || cur[1] == 0)) { return -1; } |
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int optind = opt->ind, optret; |
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if (cur[1] == '-') { |
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if (cur[2] == 0) { if (opt->nop) { |
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permute(av, opt->ind++, opt->nop); |
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opt->ind -= opt->nop; opt->nop = 0; |
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} else { ++opt->ind; } return -1; |
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} |
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int optend, lop; optret = '?'; opt->opt = 0; opt->lop = cur; |
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if (!opt->lops) { goto nol; } |
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for (optend = 2; cur[optend] != '=' && cur[optend] != 0; ++optend); |
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for (lop = 0; opt->lops[lop].str; ++lop) { |
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if (strncmp(&cur[2], opt->lops[lop].str, (size_t)optend - 2) == 0) { |
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if (!opt->lops[lop].str[optend - 2]) { |
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optret = opt->opt = opt->lops[lop].val; break; |
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} |
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} |
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} |
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if (opt->lops[lop].arg > ARG_NUL) { |
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if (cur[optend]) { opt->arg = &cur[optend + 1]; } |
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else if (av[opt->ind + 1]) { opt->arg = av[++opt->ind]; } |
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else { |
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if (opt->lops[lop].arg == ARG_REQ) { optret = ':'; } |
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opt->arg = NULL; |
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} |
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} |
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else { opt->arg = NULL; } |
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nol: opt->pos = 0; |
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} |
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else { |
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optret = opt->opt = cur[opt->pos++]; opt->lop = NULL; |
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const char *optchr = strchr(opt->str, opt->opt); |
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if (!optchr) { optret = '?'; } |
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else if (optchr[1] == ':') { |
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if (cur[opt->pos]) { opt->arg = &cur[opt->pos]; } |
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else if (av[opt->ind + 1]) { opt->arg = av[++opt->ind]; } |
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else { opt->arg = NULL; optret = ':'; } |
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opt->pos = 0; |
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} |
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else { opt->arg = NULL; } |
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} |
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if (!opt->pos || !cur[opt->pos]) { |
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++opt->ind; opt->pos = 1; |
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if (opt->nop) for (; optind < opt->ind; ++optind) { |
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permute(av, optind, opt->nop); |
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} |
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} |
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if (optret == '?' && opt->str[0] != ':') { |
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if (opt->opt) { fprintf(stderr, "%c: invalid option", opt->opt); } |
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else if (opt->lop) { fprintf(stderr, "%s: invalid option", opt->lop); } |
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} |
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if (optret == ':' && opt->str[0] != ':') { |
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if (opt->opt) { fprintf(stderr, "%c: option requires argument", opt->opt); } |
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else if (opt->lop) { fprintf(stderr, "%s: option requires argument", opt->lop); } |
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} |
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return optret; |
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} |
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static inline void permute(char **av, int i, int n) { |
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char *a = av[i]; memmove(&av[i - n + 1], &av[i - n], n * sizeof (av)); |
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av[i - n] = a; return; |
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} |
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