зеркало из https://github.com/microsoft/git.git
94 строки
1.8 KiB
C
94 строки
1.8 KiB
C
/*
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* I'm tired of doing "vsnprintf()" etc just to open a
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* file, so here's a "return static buffer with printf"
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* interface for paths.
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*
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* It's obviously not thread-safe. Sue me. But it's quite
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* useful for doing things like
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*
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* f = open(mkpath("%s/%s.git", base, name), O_RDONLY);
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*
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* which is what it's designed for.
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*/
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#include "cache.h"
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static char pathname[PATH_MAX];
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static char bad_path[] = "/bad-path/";
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static char *cleanup_path(char *path)
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{
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/* Clean it up */
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if (!memcmp(path, "./", 2)) {
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path += 2;
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while (*path == '/')
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path++;
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}
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return path;
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}
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char *mkpath(const char *fmt, ...)
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{
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va_list args;
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unsigned len;
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va_start(args, fmt);
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len = vsnprintf(pathname, PATH_MAX, fmt, args);
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va_end(args);
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if (len >= PATH_MAX)
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return bad_path;
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return cleanup_path(pathname);
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}
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char *git_path(const char *fmt, ...)
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{
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const char *git_dir;
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va_list args;
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unsigned len;
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git_dir = getenv(GIT_DIR_ENVIRONMENT);
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if (!git_dir) git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
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len = strlen(git_dir);
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if (len > PATH_MAX-100)
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return bad_path;
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memcpy(pathname, git_dir, len);
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if (len && git_dir[len-1] != '/')
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pathname[len++] = '/';
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va_start(args, fmt);
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len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
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va_end(args);
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if (len >= PATH_MAX)
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return bad_path;
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return cleanup_path(pathname);
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}
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/* git_mkstemp() - create tmp file honoring TMPDIR variable */
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int git_mkstemp(char *path, size_t len, const char *template)
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{
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char *env, *pch = path;
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if ((env = getenv("TMPDIR")) == NULL) {
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strcpy(pch, "/tmp/");
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len -= 5;
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pch += 5;
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} else {
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size_t n = snprintf(pch, len, "%s/", env);
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len -= n;
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pch += n;
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}
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safe_strncpy(pch, template, len);
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return mkstemp(path);
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}
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char *safe_strncpy(char *dest, const char *src, size_t n)
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{
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strncpy(dest, src, n);
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dest[n - 1] = '\0';
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return dest;
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}
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