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73 lines
1.6 KiB
73 lines
1.6 KiB
6 years ago
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/*
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* Copyright (c) 2018-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <string>
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char last_char1_Bad(char* s, int i) {
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char buf[1024];
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int n = snprintf(buf, sizeof(buf), "%s%d", s, i);
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return buf[n - 1];
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}
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char last_char1_Good(char* s, int i) {
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char buf[1024];
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int n = snprintf(buf, sizeof(buf), "%s%d", s, i);
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if (n > 0 && n <= sizeof(buf)) {
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return buf[n - 1];
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} else {
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return '\0';
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}
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}
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char last_char2_Bad(const char* fmt, ...) {
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char buf[1024];
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va_list args;
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va_start(args, fmt);
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int n = vsnprintf(buf, sizeof(buf), fmt, args);
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va_end(args);
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return buf[n - 1];
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}
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std::string to_string1_Bad_FN(char* s, int i) {
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char buf[1024];
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int n = snprintf(buf, sizeof(buf), "%s%d", s, i);
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return std::string(buf, n);
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}
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std::string to_string1_Good(char* s, int i) {
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char buf[1024];
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int n = snprintf(buf, sizeof(buf), "%s%d", s, i);
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if (n < 0) {
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return NULL;
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} else if (n > sizeof(buf)) {
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n = sizeof(buf);
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}
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return std::string(buf, n);
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}
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std::string to_string2_Bad_FN(const char* fmt, ...) {
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char buf[1024];
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va_list args;
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va_start(args, fmt);
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int n = vsnprintf(buf, sizeof(buf), fmt, args);
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va_end(args);
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return std::string(buf, n);
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}
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std::string to_string2_Good(const char* fmt, ...) {
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char buf[1024];
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va_list args;
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va_start(args, fmt);
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int n = vsnprintf(buf, sizeof(buf), fmt, args);
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va_end(args);
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if (n < 0) {
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return NULL;
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} else if (n > sizeof(buf)) {
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n = sizeof(buf);
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}
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return std::string(buf, n);
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}
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