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Reimplemented index_list_desc() by way of index_desc_first() and index_desc_next().

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This commit is contained in:
default 2024-07-23 09:50:56 +02:00
parent 78f383f025
commit 5921ec57f6
2 changed files with 8 additions and 16 deletions
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22
data.c
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@ -651,26 +651,16 @@ xs_list *index_list_desc(const char *fn, int skip, int show)
{
xs_list *list = xs_list_new();
FILE *f;
int n = 0;
if ((f = fopen(fn, "r")) != NULL) {
flock(fileno(f), LOCK_SH);
char md5[33];
char line[256];
if (index_desc_first(f, md5, skip)) {
int n = 1;
/* move to the end minus one entry (or more, if skipping entries) */
if (!fseek(f, 0, SEEK_END) && !fseek(f, (skip + 1) * -33, SEEK_CUR)) {
while (n < show && fgets(line, sizeof(line), f) != NULL) {
if (line[0] != '-') {
line[32] = '\0';
list = xs_list_append(list, line);
n++;
}
/* move backwards 2 entries */
if (fseek(f, -66, SEEK_CUR) == -1)
break;
}
do {
list = xs_list_append(list, md5);
} while (n++ < show && index_desc_next(f, md5));
}
fclose(f);

2
snac.h
View File

@ -101,6 +101,8 @@ int index_gc(const char *fn);
int index_first(const char *fn, char *buf, int size);
int index_len(const char *fn);
xs_list *index_list(const char *fn, int max);
int index_desc_next(FILE *f, char md5[33]);
int index_desc_first(FILE *f, char md5[33], int skip);
xs_list *index_list_desc(const char *fn, int skip, int show);
int object_add(const char *id, const xs_dict *obj);