Evaluate the argument of va_end for its side effects.

[cparser] / format_check.c

diff --git a/format_check.c b/format_check.c
index d19ba2b..5990248 100644 (file)
--- a/format_check.c
+++ b/format_check.c
@@ -157,8 +157,11 @@ static void check_printf_format(const call_argument_t *arg, const format_spec_t
 {
        /* find format arg */
        unsigned idx = 0;
-       for (; idx < spec->fmt_idx; ++idx)
+       for (; idx < spec->fmt_idx; ++idx) {
+               if (arg == NULL)
+                       return;
                arg = arg->next;
+       }
 
        const expression_t *fmt_expr = arg->expression;
        if (fmt_expr->kind == EXPR_UNARY_CAST_IMPLICIT) {
@@ -182,7 +185,7 @@ static void check_printf_format(const call_argument_t *arg, const format_spec_t
                return;
        }
        /* find the real args */
-       for(; idx < spec->arg_idx; ++idx)
+       for(; idx < spec->arg_idx && arg != NULL; ++idx)
                arg = arg->next;
 
        const source_position_t *pos = &fmt_expr->base.source_position;
@@ -515,20 +518,24 @@ eval_fmt_mod_unsigned:
 
                        default:
                                warningf(pos, "encountered unknown conversion specifier '%%%C' at position %u", (wint_t)fmt, num_fmt);
+                               if (arg == NULL) {
+                                       warningf(pos, "too few arguments for format string");
+                                       return;
+                               }
                                goto next_arg;
                }
 
                format_flags_t wrong_flags = fmt_flags & ~allowed_flags;
                if (wrong_flags != 0) {
-                       char wrong[8];
-                       int idx = 0;
-                       if (wrong_flags & FMT_FLAG_HASH)  wrong[idx++] = '#';
-                       if (wrong_flags & FMT_FLAG_ZERO)  wrong[idx++] = '0';
-                       if (wrong_flags & FMT_FLAG_MINUS) wrong[idx++] = '-';
-                       if (wrong_flags & FMT_FLAG_SPACE) wrong[idx++] = ' ';
-                       if (wrong_flags & FMT_FLAG_PLUS)  wrong[idx++] = '+';
-                       if (wrong_flags & FMT_FLAG_TICK)  wrong[idx++] = '\'';
-                       wrong[idx] = '\0';
+                       char  wrong[8];
+                       char *p = wrong;
+                       if (wrong_flags & FMT_FLAG_HASH)  *p++ = '#';
+                       if (wrong_flags & FMT_FLAG_ZERO)  *p++ = '0';
+                       if (wrong_flags & FMT_FLAG_MINUS) *p++ = '-';
+                       if (wrong_flags & FMT_FLAG_SPACE) *p++ = ' ';
+                       if (wrong_flags & FMT_FLAG_PLUS)  *p++ = '+';
+                       if (wrong_flags & FMT_FLAG_TICK)  *p++ = '\'';
+                       *p = '\0';
 
                        warningf(pos, "invalid format flags \"%s\" in conversion specification %%%c at position %u", wrong, fmt, num_fmt);
                }
@@ -573,7 +580,7 @@ next_arg:
                arg = arg->next;
        }
        if (!atend(&vchar)) {
-               warningf(pos, "format string contains NUL");
+               warningf(pos, "format string contains '\\0'");
        }
        if (arg != NULL) {
                unsigned num_args = num_fmt;
@@ -594,8 +601,11 @@ static void check_scanf_format(const call_argument_t *arg, const format_spec_t *
 {
        /* find format arg */
        unsigned idx = 0;
-       for (; idx < spec->fmt_idx; ++idx)
+       for (; idx < spec->fmt_idx; ++idx) {
+               if (arg == NULL)
+                       return;
                arg = arg->next;
+       }
 
        const expression_t *fmt_expr = arg->expression;
        if (fmt_expr->kind == EXPR_UNARY_CAST_IMPLICIT) {
@@ -619,7 +629,7 @@ static void check_scanf_format(const call_argument_t *arg, const format_spec_t *
                return;
        }
        /* find the real args */
-       for (; idx < spec->arg_idx; ++idx)
+       for (; idx < spec->arg_idx && arg != NULL; ++idx)
                arg = arg->next;
 
        const source_position_t *pos = &fmt_expr->base.source_position;
@@ -843,6 +853,10 @@ eval_fmt_mod_unsigned:
 
                        default:
                                warningf(pos, "encountered unknown conversion specifier '%%%C' at position %u", (wint_t)fmt, num_fmt);
+                               if (arg == NULL) {
+                                       warningf(pos, "too few arguments for format string");
+                                       return;
+                               }
                                goto next_arg;
                }
 
@@ -888,7 +902,7 @@ next_arg:
                arg = arg->next;
        }
        if (!atend(&vchar)) {
-               warningf(pos, "format string contains NUL");
+               warningf(pos, "format string contains '\\0'");
        }
        if (arg != NULL) {
                unsigned num_args = num_fmt;
@@ -896,7 +910,7 @@ next_arg:
                        ++num_args;
                        arg = arg->next;
                }
-               warningf(pos, "%u argument%s but only %u format string%s",
+               warningf(pos, "%u argument%s but only %u format specifier%s",
                        num_args, num_args != 1 ? "s" : "",
                        num_fmt, num_fmt != 1 ? "s" : "");
        }