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mtd: improve support for reading input from a pipe. fixes sysupgrade

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12706 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2008-09-25 18:24:18 +00:00
parent c789f9720c
commit 8114ef99e3
1 changed files with 21 additions and 9 deletions
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30
package/mtd/src/mtd.c
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@ -246,7 +246,7 @@ static int
mtd_write(int imagefd, const char *mtd) mtd_write(int imagefd, const char *mtd)
{ {
int fd, result; int fd, result;
size_t r, w, e; ssize_t r, w, e;
fd = mtd_check_open(mtd); fd = mtd_check_open(mtd);
if(fd < 0) { if(fd < 0) {
@ -263,11 +263,27 @@ mtd_write(int imagefd, const char *mtd)
for (;;) { for (;;) {
/* buffer may contain data already (from trx check) */ /* buffer may contain data already (from trx check) */
r = read(imagefd, buf + buflen, erasesize - buflen); do {
if (r < 0) r = read(imagefd, buf + buflen, erasesize - buflen);
break; if (r < 0) {
if ((errno == EINTR) || (errno == EAGAIN))
continue;
else {
perror("read");
break;
}
}
buflen += r; if (r == 0) {
fprintf(stderr, "No more data left\n");
break;
}
buflen += r;
} while (buflen < erasesize);
if (buflen == 0)
break;
if (jffs2file) { if (jffs2file) {
if (memcmp(buf, JFFS2_EOF, sizeof(JFFS2_EOF)) == 0) { if (memcmp(buf, JFFS2_EOF, sizeof(JFFS2_EOF)) == 0) {
@ -309,10 +325,6 @@ mtd_write(int imagefd, const char *mtd)
} }
w += buflen; w += buflen;
/* not enough data - eof */
if (buflen < erasesize)
break;
buflen = 0; buflen = 0;
} }
if (!quiet) if (!quiet)