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mprintf: Fix processing of width and prec args

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Prior to this change a width arg could be erroneously output, and also
width and precision args could not be used together without crashing.

"%0*d%s", 2, 9, "foo"

Before: "092"
After: "09foo"

"%*.*s", 5, 2, "foo"

Before: crash
After: "   fo"

Test 557 is updated to verify this and more
This commit is contained in:
Jay Satiro 2016-03-09 02:59:05 -05:00 • committed by Daniel Stenberg
parent 117a0ffe9f
commit 68701e51c1
3 changed files with 90 additions and 20 deletions
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60
lib/mprintf.c
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@ -460,22 +460,24 @@ static long dprintf_Pass1(const char *format, va_stack_t *vto, char **endpos,
if(flags & FLAGS_WIDTHPARAM) {
/* we have the width specified from a parameter, so we make that
parameter's info setup properly */
vto[i].width = width - 1;
i = width - 1;
vto[i].type = FORMAT_WIDTH;
vto[i].flags = FLAGS_NEW;
vto[i].precision = vto[i].width = 0; /* can't use width or precision
of width! */
long k = width - 1;
vto[i].width = k;
vto[k].type = FORMAT_WIDTH;
vto[k].flags = FLAGS_NEW;
/* can't use width or precision of width! */
vto[k].width = 0;
vto[k].precision = 0;
}
if(flags & FLAGS_PRECPARAM) {
/* we have the precision specified from a parameter, so we make that
parameter's info setup properly */
vto[i].precision = precision - 1;
i = precision - 1;
vto[i].type = FORMAT_WIDTH;
vto[i].flags = FLAGS_NEW;
vto[i].precision = vto[i].width = 0; /* can't use width or precision
of width! */
long k = precision - 1;
vto[i].precision = k;
vto[k].type = FORMAT_WIDTH;
vto[k].flags = FLAGS_NEW;
/* can't use width or precision of width! */
vto[k].width = 0;
vto[k].precision = 0;
}
*endpos++ = fmt + 1; /* end of this sequence */
}
@ -483,11 +485,15 @@ static long dprintf_Pass1(const char *format, va_stack_t *vto, char **endpos,
/* Read the arg list parameters into our data list */
for(i=0; i<max_param; i++) {
if((i + 1 < max_param) && (vto[i + 1].type == FORMAT_WIDTH)) {
/* Width/precision arguments must be read before the main argument
* they are attached to
*/
vto[i + 1].data.num.as_signed = (mp_intmax_t)va_arg(arglist, int);
/* Width/precision arguments must be read before the main argument
they are attached to */
if(vto[i].flags & FLAGS_WIDTHPARAM) {
vto[vto[i].width].data.num.as_signed =
(mp_intmax_t)va_arg(arglist, int);
}
if(vto[i].flags & FLAGS_PRECPARAM) {
vto[vto[i].precision].data.num.as_signed =
(mp_intmax_t)va_arg(arglist, int);
}
switch (vto[i].type) {
@ -640,16 +646,30 @@ static int dprintf_formatf(
p = &vto[param];
/* pick up the specified width */
if(p->flags & FLAGS_WIDTHPARAM)
if(p->flags & FLAGS_WIDTHPARAM) {
width = (long)vto[p->width].data.num.as_signed;
param_num++; /* since the width is extracted from a parameter, we
must skip that to get to the next one properly */
if(width < 0) {
/* "A negative field width is taken as a '-' flag followed by a
positive field width." */
width = -width;
p->flags |= FLAGS_LEFT;
p->flags &= ~FLAGS_PAD_NIL;
}
}
else
width = p->width;
/* pick up the specified precision */
if(p->flags & FLAGS_PRECPARAM) {
prec = (long)vto[p->precision].data.num.as_signed;
param_num++; /* since the precision is extraced from a parameter, we
param_num++; /* since the precision is extracted from a parameter, we
must skip that to get to the next one properly */
if(prec < 0)
/* "A negative precision is taken as if the precision were
omitted." */
prec = -1;
}
else if(p->flags & FLAGS_PREC)
prec = p->precision;
@ -804,7 +824,7 @@ static int dprintf_formatf(
else
len = strlen(str);
width -= (long)len;
width -= (len > LONG_MAX) ? LONG_MAX : (long)len;
if(p->flags & FLAGS_ALT)
OUTCHAR('"');