You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
73 lines
1.6 KiB
73 lines
1.6 KiB
/*
|
|
* Copyright (c) 2018-present, Facebook, Inc.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*/
|
|
#include <string>
|
|
|
|
char last_char1_Bad(char* s, int i) {
|
|
char buf[1024];
|
|
int n = snprintf(buf, sizeof(buf), "%s%d", s, i);
|
|
return buf[n - 1];
|
|
}
|
|
|
|
char last_char1_Good(char* s, int i) {
|
|
char buf[1024];
|
|
int n = snprintf(buf, sizeof(buf), "%s%d", s, i);
|
|
if (n > 0 && n <= sizeof(buf)) {
|
|
return buf[n - 1];
|
|
} else {
|
|
return '\0';
|
|
}
|
|
}
|
|
|
|
char last_char2_Bad(const char* fmt, ...) {
|
|
char buf[1024];
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
int n = vsnprintf(buf, sizeof(buf), fmt, args);
|
|
va_end(args);
|
|
return buf[n - 1];
|
|
}
|
|
|
|
std::string to_string1_Bad(char* s, int i) {
|
|
char buf[1024];
|
|
int n = snprintf(buf, sizeof(buf), "%s%d", s, i);
|
|
return std::string(buf, n);
|
|
}
|
|
|
|
std::string to_string1_Good(char* s, int i) {
|
|
char buf[1024];
|
|
int n = snprintf(buf, sizeof(buf), "%s%d", s, i);
|
|
if (n < 0) {
|
|
return NULL;
|
|
} else if (n > sizeof(buf)) {
|
|
n = sizeof(buf);
|
|
}
|
|
return std::string(buf, n);
|
|
}
|
|
|
|
std::string to_string2_Bad(const char* fmt, ...) {
|
|
char buf[1024];
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
int n = vsnprintf(buf, sizeof(buf), fmt, args);
|
|
va_end(args);
|
|
return std::string(buf, n);
|
|
}
|
|
|
|
std::string to_string2_Good(const char* fmt, ...) {
|
|
char buf[1024];
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
int n = vsnprintf(buf, sizeof(buf), fmt, args);
|
|
va_end(args);
|
|
if (n < 0) {
|
|
return NULL;
|
|
} else if (n > sizeof(buf)) {
|
|
n = sizeof(buf);
|
|
}
|
|
return std::string(buf, n);
|
|
}
|