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