diff options
Diffstat (limited to 'generic/Lgetopt.c')
| -rw-r--r-- | generic/Lgetopt.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/generic/Lgetopt.c b/generic/Lgetopt.c new file mode 100644 index 0000000..27676ec --- /dev/null +++ b/generic/Lgetopt.c @@ -0,0 +1,238 @@ +#include "Lcompile.h" + +/* for compat with code below */ +#define streq(a, b) (!strcmp(a, b)) +#define strneq(a, b, n) (!strncmp(a, b, n)) +#define assert(x) + +/* + * Copyright (c) 1997 L.W.McVoy + * + * This version handles + * + * - (leaves it and returns) + * -- end of options + * -a + * -abcd + * -r <arg> + * -r<arg> + * -abcr <arg> + * -abcr<arg> + * -r<arg> -R<arg>, etc. + * --long + * --long:<arg> + * --long=<arg> + * --long <arg> + * + * Patterns in getopt string: + * d boolean option -d + * d: required arg -dARG or -d ARG + * d; required arg no space -dARG + * d| optionial arg no space -dARG or -d + * + * With long options: + * long boolean option --long + * long: required arg --long=ARG or --long ARG + * long; required arg no space --long=ARG + * long| optionial arg no space --long=ARG or --long + */ + +int optopt; /* option that is in error, if we return an error */ +int optind; /* next arg in argv we process */ +char *optarg; /* argument to an option */ +static int n; /* current position == av[optind][n] */ +static int lastn; /* saved copy of last n */ + +private int doLong(int ac, char **av, longopt *lopts); + +void +getoptReset(void) +{ + optopt = optind = 0; + optarg = 0; +} + +void +getoptConsumed(int n1) +{ + optind--; + unless (optind) optind = 1; + n = lastn + n1; + // TRACE("optind = %d, n = %d, n1 = %d", optind, n, n1); +} + +/* + * Returns: + * - char if option found + * - GETOPT_EOF(-1) if end of arguments reached + * - GETOPT_ERR(256) if unknown option found. + */ +int +getopt(int ac, char **av, char *opts, longopt *lopts) +{ + char *t; + + optarg = 0; /* clear out arg from last round */ + optopt = 0; /* clear error return */ + if (!optind) { + optind = 1; + lastn = n; + n = 1; + } + // TRACE("GETOPT ind=%d n=%d av[%d]='%s'", optind, n, optind, av[optind]); + + if ((optind >= ac) || (av[optind][0] != '-') || !av[optind][1]) { + return (GETOPT_EOF); + } + /* Stop processing options at a -- and return arguments after */ + if (streq(av[optind], "--")) { + optind++; + lastn = n; + n = 1; + return (GETOPT_EOF); + } + if (strneq(av[optind], "--", 2)) return (doLong(ac, av, lopts)); + + assert(av[optind][n]); + for (t = (char *)opts; *t; t++) { + if (*t == av[optind][n]) { + break; + } + } + if (!*t) { + optopt = av[optind][n]; + // TRACE("%s", "ran out of option letters"); + lastn = n; + if (av[optind][n+1]) { + n++; + } else { + n = 1; + optind++; + } + return (GETOPT_ERR); + } + + /* OK, we found a legit option, let's see what to do with it. + * If it isn't one that takes an option, just advance and return. + */ + if (t[1] != ':' && t[1] != '|' && t[1] != ';') { + lastn = n; + if (!av[optind][n+1]) { + optind++; + n = 1; + } else { + n++; + } + // TRACE("Legit singleton %c", *t); + return (*t); + } + + /* got one with an option, see if it is cozied up to the flag */ + if (av[optind][n+1]) { + optarg = &av[optind][n+1]; + optind++; + lastn = n; + n = 1; + // TRACE("%c with %s", *t, optarg); + return (*t); + } + + /* If it was not there, and it is optional, OK */ + if (t[1] == '|') { + optind++; + lastn = n; + n = 1; + // TRACE("%c without arg", *t); + return (*t); + } + + /* was it supposed to be there? */ + if (t[1] == ';') { + optind++; + optopt = *t; + // TRACE("%s", "wanted another word"); + return (GETOPT_ERR); + } + + /* Nope, there had better be another word. */ + if ((optind + 1 == ac) || (av[optind+1][0] == '-')) { + optopt = av[optind][n]; + // TRACE("%s", "wanted another word"); + return (GETOPT_ERR); + } + optarg = av[optind+1]; + optind += 2; + lastn = n; + n = 1; + // TRACE("%c with arg %s", *t, optarg); + return (*t); +} + +private int +doLong(int ac, char **av, longopt *lopts) +{ + char *s, *t; + int len1, len2; + + unless (lopts) { +err: n = 1; + optind++; + optopt = 0; + return (GETOPT_ERR); + } + /* len of option without =value part */ + s = av[optind] + 2; + unless (t = strchr(s, '=')) t = strchr(s, ':'); + len1 = t ? (t - s) : strlen(s); + for (; (t = lopts->name); lopts++) { + s = av[optind] + 2; + /* len of lopts array without suffix */ + len2 = strlen(t); + if (strspn(t+len2-1, ":;|") == 1) --len2; + + if ((len1 == len2) && strneq(s, t, len1)) { + s += len1; + t += len2; + break; /* found a match */ + } + } + unless (t) goto err; + + /* OK, we found a legit option, let's see what to do with it. + * If it isn't one that takes an option, just advance and return. + */ + unless (*t) { + /* got option anyway */ + if ((*s == '=') || (*s == ':')) goto err; + optind++; + n = 1; + return (lopts->ret); + } + + /* got one with an option, see if it is cozied up to the flag */ + if ((*s == '=') || (*s == ':')) { + optarg = s + 1; + optind++; + n = 1; + return (lopts->ret); + } + + /* If it was not there, and it is optional, OK */ + if (*t == '|') { + optind++; + n = 1; + return (lopts->ret); + } + + /* was it supposed to be there? */ + if (*t == ';') goto err; + + /* Nope, there had better be another word. */ + if ((optind + 1 == ac) || (av[optind+1][0] == '-')) { + goto err; + } + optarg = av[optind+1]; + optind += 2; + n = 1; + return (lopts->ret); +} |