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9befac470b
Like xmalloc and xrealloc xstrdup dies with a useful message if the native strdup() implementation returns NULL rather than a valid pointer. I just tried to use xstrdup in new code and found it to be missing. However I expected it to be present as xmalloc and xrealloc are already commonly used throughout the code. [jc: removed the part that deals with last_XXX, which I am finding more and more dubious these days.] Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
#include <stdio.h>
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#include "cache.h"
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#include "path-list.h"
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/* if there is no exact match, point to the index where the entry could be
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* inserted */
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static int get_entry_index(const struct path_list *list, const char *path,
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int *exact_match)
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{
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int left = -1, right = list->nr;
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while (left + 1 < right) {
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int middle = (left + right) / 2;
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int compare = strcmp(path, list->items[middle].path);
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if (compare < 0)
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right = middle;
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else if (compare > 0)
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left = middle;
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else {
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*exact_match = 1;
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return middle;
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}
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}
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*exact_match = 0;
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return right;
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}
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/* returns -1-index if already exists */
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static int add_entry(struct path_list *list, const char *path)
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{
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int exact_match;
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int index = get_entry_index(list, path, &exact_match);
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if (exact_match)
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return -1 - index;
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if (list->nr + 1 >= list->alloc) {
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list->alloc += 32;
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list->items = xrealloc(list->items, list->alloc
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* sizeof(struct path_list_item));
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}
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if (index < list->nr)
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memmove(list->items + index + 1, list->items + index,
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(list->nr - index)
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* sizeof(struct path_list_item));
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list->items[index].path = list->strdup_paths ?
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xstrdup(path) : (char *)path;
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list->items[index].util = NULL;
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list->nr++;
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return index;
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}
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struct path_list_item *path_list_insert(const char *path, struct path_list *list)
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{
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int index = add_entry(list, path);
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if (index < 0)
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index = 1 - index;
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return list->items + index;
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}
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int path_list_has_path(const struct path_list *list, const char *path)
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{
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int exact_match;
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get_entry_index(list, path, &exact_match);
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return exact_match;
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}
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struct path_list_item *path_list_lookup(const char *path, struct path_list *list)
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{
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int exact_match, i = get_entry_index(list, path, &exact_match);
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if (!exact_match)
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return NULL;
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return list->items + i;
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}
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void path_list_clear(struct path_list *list, int free_items)
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{
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if (list->items) {
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int i;
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if (free_items)
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for (i = 0; i < list->nr; i++) {
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if (list->strdup_paths)
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free(list->items[i].path);
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free(list->items[i].util);
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}
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free(list->items);
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}
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list->items = NULL;
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list->nr = list->alloc = 0;
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}
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void print_path_list(const char *text, const struct path_list *p)
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{
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int i;
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if ( text )
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printf("%s\n", text);
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for (i = 0; i < p->nr; i++)
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printf("%s:%p\n", p->items[i].path, p->items[i].util);
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}
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