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utilfdt_read: pass back up the length of data read

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For a follow up commit, we want to be able to scan the buffer that was
returned to us.  In order to do that safely, we need to know how big
the buffer actually is, so create a new set of funcs to pass that back.

Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2013-04-08 00:56:54 -04:00 • committed by Jon Loeliger
parent 5543b88d5e
commit a6d55e039f
2 changed files with 29 additions and 3 deletions
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19
util.c
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@ -198,7 +198,7 @@ char get_escape_char(const char *s, int *i)
return val;
}
int utilfdt_read_err(const char *filename, char **buffp)
int utilfdt_read_err_len(const char *filename, char **buffp, off_t *len)
{
int fd = 0; /* assume stdin */
char *buf = NULL;
@ -239,13 +239,20 @@ int utilfdt_read_err(const char *filename, char **buffp)
free(buf);
else
*buffp = buf;
*len = bufsize;
return ret;
}
char *utilfdt_read(const char *filename)
int utilfdt_read_err(const char *filename, char **buffp)
{
off_t len;
return utilfdt_read_err_len(filename, buffp, &len);
}
char *utilfdt_read_len(const char *filename, off_t *len)
{
char *buff;
int ret = utilfdt_read_err(filename, &buff);
int ret = utilfdt_read_err_len(filename, &buff, len);
if (ret) {
fprintf(stderr, "Couldn't open blob from '%s': %s\n", filename,
@ -256,6 +263,12 @@ char *utilfdt_read(const char *filename)
return buff;
}
char *utilfdt_read(const char *filename)
{
off_t len;
return utilfdt_read_len(filename, &len);
}
int utilfdt_write_err(const char *filename, const void *blob)
{
int fd = 1; /* assume stdout */