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Diffstat (limited to 'xorg-server/os/log.c')
-rw-r--r--xorg-server/os/log.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/xorg-server/os/log.c b/xorg-server/os/log.c
index 3af277b72..64796a052 100644
--- a/xorg-server/os/log.c
+++ b/xorg-server/os/log.c
@@ -361,6 +361,7 @@ vpnprintf(char *string, int size_in, const char *f, va_list args)
uint64_t ui;
int64_t si;
size_t size = size_in;
+ int precision;
for (; f_idx < f_len && s_idx < size - 1; f_idx++) {
int length_modifier = 0;
@@ -371,9 +372,29 @@ vpnprintf(char *string, int size_in, const char *f, va_list args)
f_idx++;
- /* silently swallow digit length modifiers */
- while (f_idx < f_len && ((f[f_idx] >= '0' && f[f_idx] <= '9') || f[f_idx] == '.'))
+ /* silently swallow minimum field width */
+ if (f[f_idx] == '*') {
f_idx++;
+ va_arg(args, int);
+ } else {
+ while (f_idx < f_len && ((f[f_idx] >= '0' && f[f_idx] <= '9')))
+ f_idx++;
+ }
+
+ /* is there a precision? */
+ precision = size;
+ if (f[f_idx] == '.') {
+ f_idx++;
+ if (f[f_idx] == '*') {
+ f_idx++;
+ /* precision is supplied in an int argument */
+ precision = va_arg(args, int);
+ } else {
+ /* silently swallow precision digits */
+ while (f_idx < f_len && ((f[f_idx] >= '0' && f[f_idx] <= '9')))
+ f_idx++;
+ }
+ }
/* non-digit length modifiers */
if (f_idx < f_len) {
@@ -389,9 +410,8 @@ vpnprintf(char *string, int size_in, const char *f, va_list args)
switch (f[f_idx]) {
case 's':
string_arg = va_arg(args, char*);
- p_len = strlen_sigsafe(string_arg);
- for (i = 0; i < p_len && s_idx < size - 1; i++)
+ for (i = 0; string_arg[i] != 0 && s_idx < size - 1 && s_idx < precision; i++)
string[s_idx++] = string_arg[i];
break;