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120 lines
2.8 KiB
120 lines
2.8 KiB
/* commas.c - Deal with comma separated lists
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*
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* Copyright 2018 Rob Landley <rob@landley.net>
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*/
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#include "toys.h"
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// Traverse arg_list of csv, calling callback on each value
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void comma_args(struct arg_list *al, void *data, char *err,
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char *(*callback)(void *data, char *str, int len))
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{
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char *next, *arg;
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int len;
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if (CFG_TOYBOX_DEBUG && !err) err = "INTERNAL";
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while (al) {
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arg = al->arg;
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while ((next = comma_iterate(&arg, &len)))
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if ((next = callback(data, next, len)))
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error_exit("%s '%s'\n%*c", err, al->arg,
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(int)(5+strlen(toys.which->name)+strlen(err)+next-al->arg), '^');
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al = al->next;
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}
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}
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// Realloc *old with oldstring,newstring
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void comma_collate(char **old, char *new)
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{
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char *temp, *atold = *old;
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// Only add a comma if old string didn't end with one
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if (atold && *atold) {
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char *comma = ",";
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if (atold[strlen(atold)-1] == ',') comma = "";
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temp = xmprintf("%s%s%s", atold, comma, new);
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} else temp = xstrdup(new);
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free (atold);
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*old = temp;
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}
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// iterate through strings in a comma separated list.
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// returns start of next entry or NULL if none
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// sets *len to length of entry (not including comma)
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// advances *list to start of next entry
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char *comma_iterate(char **list, int *len)
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{
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char *start = *list, *end;
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if (!*list || !**list) return 0;
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if (!(end = strchr(*list, ','))) {
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*len = strlen(*list);
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*list = 0;
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} else *list += (*len = end-start)+1;
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return start;
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}
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// Check all instances of opt and "no"opt in optlist, return true if opt
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// found and last instance wasn't no. If clean, remove each instance from list.
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int comma_scan(char *optlist, char *opt, int clean)
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{
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int optlen = strlen(opt), len, no, got = 0;
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if (optlist) for (;;) {
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char *s = comma_iterate(&optlist, &len);
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if (!s) break;
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no = 2*(*s == 'n' && s[1] == 'o');
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if (optlen == len-no && !strncmp(opt, s+no, optlen)) {
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got = !no;
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if (clean) {
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if (optlist) memmove(s, optlist, strlen(optlist)+1);
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else *s = 0;
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}
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}
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}
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return got;
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}
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// return true if all scanlist options enabled in optlist
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int comma_scanall(char *optlist, char *scanlist)
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{
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int i = 1;
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while (scanlist && *scanlist) {
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char *opt = comma_iterate(&scanlist, &i), *s = xstrndup(opt, i);
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i = comma_scan(optlist, s, 0);
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free(s);
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if (!i) break;
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}
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return i;
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}
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// Returns true and removes `opt` from `optlist` if present, false otherwise.
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// Doesn't have the magic "no" behavior of comma_scan.
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int comma_remove(char *optlist, char *opt)
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{
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int optlen = strlen(opt), len, got = 0;
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if (optlist) for (;;) {
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char *s = comma_iterate(&optlist, &len);
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if (!s) break;
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if (optlen == len && !strncmp(opt, s, optlen)) {
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got = 1;
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if (optlist) memmove(s, optlist, strlen(optlist)+1);
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else *s = 0;
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}
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}
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return got;
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}
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