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sh: Use vsnprintf() rather than crafting our own in fmtstr().

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Add INTOFF/INTON as longjmp out of vsnprintf may cause memory leaks or
undefined behaviour.
This commit is contained in:
Jilles Tjoelker 2010-12-11 17:47:27 +00:00
parent 76423e6e3c
commit 6903c6832e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=216380
1 changed files with 5 additions and 18 deletions
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23
bin/sh/output.c
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@ -64,8 +64,7 @@ __FBSDID("$FreeBSD$");
#define OUTBUFSIZ BUFSIZ
#define BLOCK_OUT -2 /* output to a fixed block of memory */
#define MEM_OUT -3 /* output to dynamically allocated memory */
#define MEM_OUT -2 /* output to dynamically allocated memory */
#define OUTPUT_ERR 01 /* error occurred on output */
static int doformat_wr(void *, const char *, int);
@ -180,18 +179,12 @@ outbin(const void *data, size_t len, struct output *file)
outc(*p++, file);
}
static char out_junk[16];
void
emptyoutbuf(struct output *dest)
{
int offset;
if (dest->fd == BLOCK_OUT) {
dest->nextc = out_junk;
dest->nleft = sizeof out_junk;
dest->flags |= OUTPUT_ERR;
} else if (dest->buf == NULL) {
if (dest->buf == NULL) {
INTOFF;
dest->buf = ckmalloc(dest->bufsize);
dest->nextc = dest->buf;
@ -282,18 +275,12 @@ void
fmtstr(char *outbuf, int length, const char *fmt, ...)
{
va_list ap;
struct output strout;
strout.nextc = outbuf;
strout.nleft = length;
strout.fd = BLOCK_OUT;
strout.flags = 0;
INTOFF;
va_start(ap, fmt);
doformat(&strout, fmt, ap);
vsnprintf(outbuf, length, fmt, ap);
va_end(ap);
outc('\0', &strout);
if (strout.flags & OUTPUT_ERR)
outbuf[length - 1] = '\0';
INTON;
}
static int