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tools: fw_env: Fix warning when reading too little

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When using CONFIG_ENV_IS_IN_FAT and the config-file specifies a size
larger than what U-Boot wrote into the env-file, a confusing error
message is shown:

    $ fw_printenv
    Read error on /boot/uboot.env: Success

Fix this by showing a different error message when read returns too
little data.

Signed-off-by: Harald Seiler <hws@denx.de>
This commit is contained in:
Harald Seiler 2020-05-28 17:54:45 +02:00 committed by Tom Rini
parent 95712afc17
commit 50bb682c5c
1 changed files with 7 additions and 1 deletions
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8
tools/env/fw_env.c vendored
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@ -946,11 +946,17 @@ static int flash_read_buf(int dev, int fd, void *buf, size_t count,
lseek(fd, blockstart + block_seek, SEEK_SET);
rc = read(fd, buf + processed, readlen);
if (rc != readlen) {
if (rc == -1) {
fprintf(stderr, "Read error on %s: %s\n",
DEVNAME(dev), strerror(errno));
return -1;
}
if (rc != readlen) {
fprintf(stderr, "Read error on %s: "
"Attempted to read %d bytes but got %d\n",
DEVNAME(dev), readlen, rc);
return -1;
}
#ifdef DEBUG
fprintf(stderr, "Read 0x%x bytes at 0x%llx on %s\n",
rc, (unsigned long long)blockstart + block_seek,