66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
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#include "cache.h"
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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/* Name of the dotfile kept inside each cloned repo. */
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#define CACHE_FILENAME ".gbuild_cache"
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/* ----------------------------------------------------------------- helpers */
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static void cache_path(char *out, size_t n, const char *repo_path)
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{
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snprintf(out, n, "%s/" CACHE_FILENAME, repo_path);
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}
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/* ----------------------------------------------------------------- public API */
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int cache_read(const char *repo_path, char *out, size_t n)
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{
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char path[1024];
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cache_path(path, sizeof(path), repo_path);
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out[0] = '\0';
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FILE *f = fopen(path, "r");
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if (!f)
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return -1; /* file doesn't exist yet — not an error, just a cache miss */
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char buf[CACHE_HASH_LEN] = {0};
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int ok = (fgets(buf, sizeof(buf), f) != NULL);
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fclose(f);
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if (!ok || buf[0] == '\0')
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return -1;
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/* strip trailing newline */
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size_t l = strlen(buf);
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if (l > 0 && buf[l - 1] == '\n')
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buf[--l] = '\0';
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if (l == 0)
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return -1;
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strncpy(out, buf, n - 1);
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out[n - 1] = '\0';
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return 0;
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}
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int cache_write(const char *repo_path, const char *hash)
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{
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char path[1024];
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cache_path(path, sizeof(path), repo_path);
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FILE *f = fopen(path, "w");
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if (!f) {
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fprintf(stderr, "[WARN ] cache_write: cannot open %s: %s\n",
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path, strerror(errno));
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return -1;
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}
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fprintf(f, "%s\n", hash);
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fclose(f);
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return 0;
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}
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