diff options
Diffstat (limited to '')
| -rw-r--r-- | src/util.c | 12 | ||||
| -rw-r--r-- | src/util/io.h | 16 |
2 files changed, 25 insertions, 3 deletions
@@ -157,6 +157,18 @@ pwriteall(int fd, void *buf, size_t n, size_t ptr) return 0; } +int +writezeroes(int fd, void *buf, size_t bufsize, size_t n) +{ + size_t p, m; + for (p = 0; p < n; p += m) { + m = bufsize < n - p ? bufsize : n - p; + if (writeall(fd, buf, m)) + return -1; + } + return 0; +} + static inline pid_t enfork(int status) diff --git a/src/util/io.h b/src/util/io.h index 81b8f51..44e222d 100644 --- a/src/util/io.h +++ b/src/util/io.h @@ -1,8 +1,9 @@ /* See LICENSE file for copyright and license details. */ -#define ewriteall(...) enwriteall(1, __VA_ARGS__) -#define ereadall(...) enreadall(1, __VA_ARGS__) -#define epwriteall(...) enpwriteall(1, __VA_ARGS__) +#define ewriteall(...) enwriteall(1, __VA_ARGS__) +#define ereadall(...) enreadall(1, __VA_ARGS__) +#define epwriteall(...) enpwriteall(1, __VA_ARGS__) +#define ewritezeroes(...) enwritezeroes(1, __VA_ARGS__) int writeall(int fd, void *buf, size_t n); @@ -32,3 +33,12 @@ enpwriteall(int status, int fd, void *buf, size_t n, size_t ptr, const char *fna if (pwriteall(fd, buf, n, ptr)) enprintf(status, "pwrite %s:", fname); } + +int writezeroes(int fd, void *buf, size_t bufsize, size_t n); + +static inline void +enwritezeroes(int status, int fd, void *buf, size_t bufsize, size_t n, const char *fname) +{ + if (writezeroes(fd, buf, bufsize, n)) + enprintf(status, "write %s:", fname); +} |