74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
#include <inc/args.h>
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#include <inc/string.h>
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void
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argstart(int *argc, char **argv, struct Argstate *args)
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{
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args->argc = argc;
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args->argv = (const char **) argv;
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args->curarg = (*argc > 1 && argv ? "" : 0);
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args->argvalue = 0;
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}
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int
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argnext(struct Argstate *args)
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{
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int arg;
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args->argvalue = 0;
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// Done processing arguments if args->curarg == 0
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if (args->curarg == 0)
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return -1;
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if (!*args->curarg) {
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// Need to process the next argument
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// Check for end of argument list
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if (*args->argc == 1
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|| args->argv[1][0] != '-'
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|| args->argv[1][1] == '\0')
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goto endofargs;
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// Shift arguments down one
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args->curarg = args->argv[1] + 1;
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memmove(args->argv + 1, args->argv + 2, sizeof(const char *) * (*args->argc - 1));
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(*args->argc)--;
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// Check for "--": end of argument list
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if (args->curarg[0] == '-' && args->curarg[1] == '\0')
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goto endofargs;
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}
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arg = (unsigned char) *args->curarg;
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args->curarg++;
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return arg;
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endofargs:
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args->curarg = 0;
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return -1;
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}
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char *
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argvalue(struct Argstate *args)
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{
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return (char*) (args->argvalue ? args->argvalue : argnextvalue(args));
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}
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char *
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argnextvalue(struct Argstate *args)
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{
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if (!args->curarg)
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return 0;
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if (*args->curarg) {
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args->argvalue = args->curarg;
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args->curarg = "";
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} else if (*args->argc > 1) {
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args->argvalue = args->argv[1];
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memmove(args->argv + 1, args->argv + 2, sizeof(const char *) * (*args->argc - 1));
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(*args->argc)--;
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} else {
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args->argvalue = 0;
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args->curarg = 0;
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}
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return (char*) args->argvalue;
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}
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