diff options
| -rw-r--r-- | os/log.c | 28 |
1 files changed, 24 insertions, 4 deletions
@@ -355,6 +355,7 @@ 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; @@ -365,9 +366,29 @@ 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) { @@ -383,9 +404,8 @@ 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; |