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d34cf19b89
With the new-and-improved write_in_full() semantics, where a partial write simply always returns a real error (and always sets 'errno' when that happens, including for the disk full case), a lot of the callers of write_in_full() were just unnecessarily complex. In particular, there's no reason to ever check for a zero length or return: if the length was zero, we'll return zero, otherwise, if a disk full resulted in the actual write() system call returning zero the write_in_full() logic would have correctly turned that into a negative return value, with 'errno' set to ENOSPC. I really wish every "write_in_full()" user would just check against "<0" now, but this fixes the nasty and stupid ones. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
91 lines
1.5 KiB
C
91 lines
1.5 KiB
C
#include "cache.h"
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int read_in_full(int fd, void *buf, size_t count)
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{
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char *p = buf;
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ssize_t total = 0;
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ssize_t loaded = 0;
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while (count > 0) {
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loaded = xread(fd, p, count);
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if (loaded <= 0) {
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if (total)
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return total;
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else
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return loaded;
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}
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count -= loaded;
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p += loaded;
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total += loaded;
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}
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return total;
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}
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void read_or_die(int fd, void *buf, size_t count)
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{
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ssize_t loaded;
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if (!count)
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return;
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loaded = read_in_full(fd, buf, count);
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if (loaded == 0)
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die("unexpected end of file");
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else if (loaded < 0)
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die("read error (%s)", strerror(errno));
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}
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int write_in_full(int fd, const void *buf, size_t count)
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{
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const char *p = buf;
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ssize_t total = 0;
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while (count > 0) {
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size_t written = xwrite(fd, p, count);
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if (written < 0)
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return -1;
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if (!written) {
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errno = ENOSPC;
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return -1;
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}
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count -= written;
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p += written;
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total += written;
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}
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return total;
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}
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void write_or_die(int fd, const void *buf, size_t count)
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{
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if (write_in_full(fd, buf, count) < 0) {
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if (errno == EPIPE)
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exit(0);
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die("write error (%s)", strerror(errno));
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}
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}
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int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
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{
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if (write_in_full(fd, buf, count) < 0) {
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if (errno == EPIPE)
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exit(0);
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fprintf(stderr, "%s: write error (%s)\n",
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msg, strerror(errno));
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return 0;
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}
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return 1;
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}
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int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
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{
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if (write_in_full(fd, buf, count) < 0) {
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fprintf(stderr, "%s: write error (%s)\n",
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msg, strerror(errno));
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return 0;
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}
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return 1;
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}
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