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#include "xdvi-config.h"
#include "xdvi.h"
#include "util.h"
#include "string_list.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* Helper functions for string lists
*/
char *
string_list_to_str(char **list, const char *sep)
{
char *result = xstrdup("");
int i;
for (i = 0; list[i] != NULL; i++) {
result = xstrcat(result, list[i]);
result = xstrcat(result, sep);
}
return result;
}
void
string_list_print(char **list)
{
int i;
for (i = 0; list != NULL && list[i] != NULL; i++) {
fprintf(stderr, "List %d: |%s|\n", i, list[i]);
}
}
/*
* Reorder the list so that str (which is supposed to occur in the list somewhere)
* is the first element.
*/
char **
string_list_reorder(char **list, char *str)
{
size_t i;
char *tmp;
Boolean found = False;
for (i = 0; list[i] != NULL; i++) {
if (strcmp(list[i], str) == 0) {
found = True;
break;
}
}
if (!found) {
XDVI_ERROR((stderr, "Item `%s' not found in list!\n", str));
return list;
}
tmp = list[0];
list[0] = str;
list[i] = tmp;
return list;
}
/*
* Move the item at position idx to the start of the list,
* by iteratively swapping it with its predecessor.
*/
char **
string_list_move_to_start(char **list, size_t idx)
{
size_t i;
#if 0
for (i = 0; list[i] != NULL; i++) {
fprintf(stderr, "list before: %d: |%s|\n", i, list[i]);
}
#endif
for (i = idx; i > 0; i--) {
char *tmp = list[i];
list[i] = list[i - 1];
list[i - 1] = tmp;
}
#if 0
for (i = 0; list[i] != NULL; i++) {
fprintf(stderr, "list after: %d: |%s|\n", i, list[i]);
}
#endif
return list;
}
/*
* Rotate the list so that the first element is shifted to the end,
* and all next elements are moved down by 1; e.g.:
* before rotate: a b c d e f
* after rotate: b c d e f a
*/
char **
string_list_rotate_down(char **list)
{
size_t i;
char *tmp;
tmp = list[0];
if (tmp == NULL) {
return list;
}
for (i = 1; list[i] != NULL; i++) {
list[i - 1] = list[i];
}
list[i - 1] = tmp;
return list;
}
/*
* Rotate the list so that the last element is shifted to the beginning,
* and all next elements are moved up by 1; e.g.:
* before rotate: a b c d e f
* after rotate: f a b c d e
*/
char **
string_list_rotate_up(char **list)
{
size_t i;
char *tmp = NULL;
if (list[0] == NULL) {
return list;
}
/* go to end */
for (i = 0; list[i] != NULL; i++) { ; }
i--; /* get last index */
tmp = list[i];
for (; i > 0; i--) {
list[i] = list[i - 1];
}
list[0] = tmp;
return list;
}
char **
string_list_prepend(char **list, const char *str)
{
int i, k;
/* reallocate with larger capacity */
for (i = 0; list[i] != NULL; i++) { ; }
i++;
list = xrealloc(list, (i + 1) * sizeof *list);
/* shift old contents down */
for (k = i; k > 0; k--) {
list[k] = list[k - 1];
}
/* add new element at beginning */
list[0] = xstrdup(str);
return list;
}
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