#include "format_check.h"
#include "symbol_t.h"
#include "ast_t.h"
+#include "entity_t.h"
#include "diagnostic.h"
#include "types.h"
#include "type_t.h"
return names[mod];
}
-static void warn_invalid_length_modifier(const source_position_t pos,
+static void warn_invalid_length_modifier(const source_position_t *pos,
const format_length_modifier_t mod,
const wchar_rep_t conversion)
{
return self->position + 1 == self->size;
}
-static void check_format_arguments(const call_argument_t *const fmt_arg, const call_argument_t* arg)
+/**
+ * Check printf-style format.
+ */
+static void check_format_arguments(const call_argument_t *arg, unsigned idx_fmt,
+ unsigned idx_param)
{
- const expression_t *fmt_expr = fmt_arg->expression;
+ /* find format arg */
+ unsigned idx = 0;
+ for (; idx < idx_fmt; ++idx)
+ arg = arg->next;
+
+ const expression_t *fmt_expr = arg->expression;
if (fmt_expr->kind == EXPR_UNARY_CAST_IMPLICIT) {
fmt_expr = fmt_expr->unary.value;
}
} else {
return;
}
- const source_position_t pos = fmt_expr->base.source_position;
- unsigned fmt = vchar.first(&vchar);
+ /* find the real args */
+ for(; idx < idx_param; ++idx)
+ arg = arg->next;
+
+ const source_position_t *pos = &fmt_expr->base.source_position;
+ unsigned fmt = vchar.first(&vchar);
+ unsigned num_fmt = 0;
for (; fmt != '\0'; fmt = vchar.next(&vchar)) {
if (fmt != '%')
continue;
if (fmt == '%')
continue;
+ ++num_fmt;
+
format_flags_t fmt_flags = FMT_FLAG_NONE;
if (fmt == '0') {
fmt = vchar.next(&vchar);
case ' ':
if (fmt_flags & FMT_FLAG_PLUS) {
- warningf(pos, "' ' is overridden by prior '+' in conversion specification");
+ warningf(pos, "' ' is overridden by prior '+' in conversion specification %u", num_fmt);
}
flag = FMT_FLAG_SPACE;
break;
case '+':
if (fmt_flags & FMT_FLAG_SPACE) {
- warningf(pos, "'+' overrides prior ' ' in conversion specification");
+ warningf(pos, "'+' overrides prior ' ' in conversion specification %u", num_fmt);
}
flag = FMT_FLAG_PLUS;
break;
default: goto break_fmt_flags;
}
if (fmt_flags & flag) {
- warningf(pos, "repeated flag '%c' in conversion specification", (char)fmt);
+ warningf(pos, "repeated flag '%c' in conversion specification %u", (char)fmt, num_fmt);
}
fmt_flags |= flag;
fmt = vchar.next(&vchar);
/* minimum field width */
if (fmt == '*') {
+ fmt = vchar.next(&vchar);
if (arg == NULL) {
- warningf(pos, "missing argument for '*' field width in conversion specification");
+ warningf(pos, "missing argument for '*' field width in conversion specification %u", num_fmt);
return;
}
const type_t *const arg_type = arg->expression->base.type;
if (arg_type != type_int) {
- warningf(pos, "argument for '*' field width in conversion specification is not an 'int', but an '%T'", arg_type);
+ warningf(pos, "argument for '*' field width in conversion specification %u is not an 'int', but an '%T'", num_fmt, arg_type);
}
arg = arg->next;
} else {
if (fmt == '.') {
fmt = vchar.next(&vchar);
if (fmt == '*') {
+ fmt = vchar.next(&vchar);
if (arg == NULL) {
- warningf(pos, "missing argument for '*' precision in conversion specification");
+ warningf(pos, "missing argument for '*' precision in conversion specification %u", num_fmt);
return;
}
const type_t *const arg_type = arg->expression->base.type;
if (arg_type != type_int) {
- warningf(pos, "argument for '*' precision in conversion specification is not an 'int', but an '%T'", arg_type);
+ warningf(pos, "argument for '*' precision in conversion specification %u is not an 'int', but an '%T'", num_fmt, arg_type);
}
arg = arg->next;
} else {
break;
}
- const type_t *expected_type;
+ type_t *expected_type;
type_qualifiers_t expected_qual = TYPE_QUALIFIER_NONE;
format_flags_t allowed_flags;
switch (fmt) {
case 'x':
allowed_flags = FMT_FLAG_MINUS | FMT_FLAG_HASH | FMT_FLAG_ZERO;
goto eval_fmt_mod_unsigned;
- break;
case 'u':
allowed_flags = FMT_FLAG_MINUS | FMT_FLAG_ZERO;
}
expected_type = type_wchar_t_ptr;
expected_qual = TYPE_QUALIFIER_CONST;
- allowed_flags = FMT_FLAG_NONE;
+ allowed_flags = FMT_FLAG_MINUS;
break;
case 's':
goto next_arg;
}
expected_qual = TYPE_QUALIFIER_CONST;
- allowed_flags = FMT_FLAG_NONE;
+ allowed_flags = FMT_FLAG_MINUS;
break;
case 'p':
break;
default:
- warningf(pos, "encountered unknown conversion specifier '%%%C'", (wint_t)fmt);
+ warningf(pos, "encountered unknown conversion specifier '%%%C' at position %u", (wint_t)fmt, num_fmt);
goto next_arg;
}
- if ((fmt_flags & ~allowed_flags) != 0) {
- /* TODO better warning message text */
- warningf(pos, "invalid format flags in conversion specification");
+ 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';
+
+ warningf(pos, "invalid format flags \"%s\" in conversion specification %%%c at position %u", wrong, fmt, num_fmt);
}
if (arg == NULL) {
}
{ /* create a scope here to prevent warning about the jump to next_arg */
- type_t *const arg_type = arg->expression->base.type;
- if (is_type_pointer(expected_type)) {
- type_t *const arg_skip = skip_typeref(arg_type);
+ type_t *const arg_type = arg->expression->base.type;
+ type_t *const arg_skip = skip_typeref(arg_type);
+ type_t *const expected_type_skip = skip_typeref(expected_type);
+ if (is_type_pointer(expected_type_skip)) {
if (is_type_pointer(arg_skip)) {
- type_t *const exp_to = skip_typeref(expected_type->pointer.points_to);
+ type_t *const exp_to = skip_typeref(expected_type_skip->pointer.points_to);
type_t *const arg_to = skip_typeref(arg_skip->pointer.points_to);
if ((arg_to->base.qualifiers & ~expected_qual) == 0 &&
get_unqualified_type(arg_to) == exp_to) {
}
}
} else {
- if (get_unqualified_type(skip_typeref(arg_type)) == expected_type) {
+ if (get_unqualified_type(arg_skip) == expected_type_skip) {
goto next_arg;
}
}
- if (is_type_valid(arg_type)) {
+ if (is_type_valid(arg_skip)) {
warningf(pos,
- "argument type '%T' does not match conversion specifier '%%%s%c'",
- arg_type, get_length_modifier_name(fmt_mod), (char)fmt);
+ "argument type '%T' does not match conversion specifier '%%%s%c' at position %u",
+ arg_type, get_length_modifier_name(fmt_mod), (char)fmt, num_fmt);
}
}
next_arg:
warningf(pos, "format string contains NUL");
}
if (arg != NULL) {
- warningf(pos, "too many arguments for format string");
+ unsigned num_args = num_fmt;
+ while (arg != NULL) {
+ ++num_args;
+ arg = arg->next;
+ }
+ warningf(pos, "%u argument%s but only %u format string%s",
+ num_args, num_args != 1 ? "s" : "",
+ num_fmt, num_fmt != 1 ? "s" : "");
}
}
+static const struct {
+ const char *name;
+ format_kind_t fmt_kind;
+ unsigned fmt_idx;
+ unsigned arg_idx;
+} builtin_table[] = {
+ { "printf", FORMAT_PRINTF, 0, 1 },
+ { "wprintf", FORMAT_PRINTF, 0, 1 },
+ { "sprintf", FORMAT_PRINTF, 1, 2 },
+ { "swprintf", FORMAT_PRINTF, 1, 2 },
+ { "snprintf", FORMAT_PRINTF, 2, 3 },
+ { "snwprintf", FORMAT_PRINTF, 2, 3 },
+ { "fprintf", FORMAT_PRINTF, 1, 2 },
+ { "fwprintf", FORMAT_PRINTF, 1, 2 },
+ { "snwprintf", FORMAT_PRINTF, 2, 3 },
+ { "snwprintf", FORMAT_PRINTF, 2, 3 },
+
+ { "scanf", FORMAT_SCANF, 0, 1 },
+ { "wscanf", FORMAT_SCANF, 0, 1 },
+ { "sscanf", FORMAT_SCANF, 1, 2 },
+ { "swscanf", FORMAT_SCANF, 1, 2 },
+ { "fscanf", FORMAT_SCANF, 1, 2 },
+ { "fwscanf", FORMAT_SCANF, 1, 2 },
+
+ { "strftime", FORMAT_STRFTIME, 3, 4 },
+ { "wcstrftime", FORMAT_STRFTIME, 3, 4 },
+
+ { "strfmon", FORMAT_STRFMON, 3, 4 },
+
+ /* MS extensions */
+ { "_snprintf", FORMAT_PRINTF, 2, 3 },
+ { "_snwprintf", FORMAT_PRINTF, 2, 3 },
+ { "_scrintf", FORMAT_PRINTF, 0, 1 },
+ { "_scwprintf", FORMAT_PRINTF, 0, 1 },
+ { "printf_s", FORMAT_PRINTF, 0, 1 },
+ { "wprintf_s", FORMAT_PRINTF, 0, 1 },
+ { "sprintf_s", FORMAT_PRINTF, 3, 4 },
+ { "swprintf_s", FORMAT_PRINTF, 3, 4 },
+ { "fprintf_s", FORMAT_PRINTF, 1, 2 },
+ { "fwprintf_s", FORMAT_PRINTF, 1, 2 },
+ { "_sprintf_l", FORMAT_PRINTF, 1, 3 },
+ { "_swprintf_l", FORMAT_PRINTF, 1, 3 },
+ { "_printf_l", FORMAT_PRINTF, 0, 2 },
+ { "_wprintf_l", FORMAT_PRINTF, 0, 2 },
+ { "_fprintf_l", FORMAT_PRINTF, 1, 3 },
+ { "_fwprintf_l", FORMAT_PRINTF, 1, 3 },
+ { "_printf_s_l", FORMAT_PRINTF, 0, 2 },
+ { "_wprintf_s_l", FORMAT_PRINTF, 0, 2 },
+ { "_sprintf_s_l", FORMAT_PRINTF, 3, 5 },
+ { "_swprintf_s_l", FORMAT_PRINTF, 3, 5 },
+ { "_fprintf_s_l", FORMAT_PRINTF, 1, 3 },
+ { "_fwprintf_s_l", FORMAT_PRINTF, 1, 3 },
+};
+
void check_format(const call_expression_t *const call)
{
if (!warning.format)
if (func_expr->kind != EXPR_REFERENCE)
return;
- const char *const name = func_expr->reference.symbol->string;
- const call_argument_t * arg = call->arguments;
- if (strcmp(name, "wprintf") == 0) { /* TODO gammlig */
- check_format_arguments(arg, arg->next);
- } else if (strcmp(name, "printf") == 0) {
- check_format_arguments(arg, arg->next);
- } else if (strcmp(name, "swprintf") == 0) {
- arg = arg->next->next; /* skip destination buffer and size */
- check_format_arguments(arg, arg->next);
- } else if (strcmp(name, "sprintf") == 0) {
- arg = arg->next->next; /* skip destination buffer and size */
- check_format_arguments(arg, arg->next);
+ const entity_t *const entity = func_expr->reference.entity;
+ const call_argument_t * arg = call->arguments;
+
+ if(false) {
+ /* the declaration has a GNU format attribute, check it */
+ } else {
+ /*
+ * For some functions we always check the format, even if it was not specified.
+ * This allows to check format even in MS mode or without header included.
+ */
+ const char *const name = entity->base.symbol->string;
+ for(size_t i = 0; i < sizeof(builtin_table) / sizeof(builtin_table[0]); ++i) {
+ if(strcmp(name, builtin_table[i].name) == 0) {
+ if(builtin_table[i].fmt_kind == FORMAT_PRINTF) {
+ check_format_arguments(arg,
+ builtin_table[i].fmt_idx,
+ builtin_table[i].arg_idx);
+ }
+ break;
+ }
+ }
}
}
projects / cparser / blobdiff