diff options
Diffstat (limited to 'wrapper.c')
| -rw-r--r-- | wrapper.c | 52 |
1 files changed, 50 insertions, 2 deletions
@@ -152,6 +152,9 @@ void *xcalloc(size_t nmemb, size_t size) { void *ret; + if (unsigned_mult_overflows(nmemb, size)) + die("data too large to fit into virtual memory space"); + memory_limit_check(size * nmemb, 0); ret = calloc(nmemb, size); if (!ret && (!nmemb || !size)) @@ -236,8 +239,24 @@ ssize_t xread(int fd, void *buf, size_t len) len = MAX_IO_SIZE; while (1) { nr = read(fd, buf, len); - if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) - continue; + if (nr < 0) { + if (errno == EINTR) + continue; + if (errno == EAGAIN || errno == EWOULDBLOCK) { + struct pollfd pfd; + pfd.events = POLLIN; + pfd.fd = fd; + /* + * it is OK if this poll() failed; we + * want to leave this infinite loop + * only when read() returns with + * success, or an expected failure, + * which would be checked by the next + * call to read(2). + */ + poll(&pfd, 1, -1); + } + } return nr; } } @@ -375,6 +394,19 @@ FILE *xfdopen(int fd, const char *mode) return stream; } +FILE *fopen_for_writing(const char *path) +{ + FILE *ret = fopen(path, "w"); + + if (!ret && errno == EPERM) { + if (!unlink(path)) + ret = fopen(path, "w"); + else + errno = EPERM; + } + return ret; +} + int xmkstemp(char *template) { int fd; @@ -609,6 +641,22 @@ char *xgetcwd(void) return strbuf_detach(&sb, NULL); } +int xsnprintf(char *dst, size_t max, const char *fmt, ...) +{ + va_list ap; + int len; + + va_start(ap, fmt); + len = vsnprintf(dst, max, fmt, ap); + va_end(ap); + + if (len < 0) + die("BUG: your snprintf is broken"); + if (len >= max) + die("BUG: attempt to snprintf into too-small buffer"); + return len; +} + static int write_file_v(const char *path, int fatal, const char *fmt, va_list params) { |