这里就是sprintf和snprintf最主要的区别:snprintf通过提供缓冲区的可用大小传入参数来保证缓冲区的不溢出,如果超出缓冲区大小则进行截断。但是对于snprintf函数,还有一些细微的差别需要注意。 snprintf函数的返回值 sprintf函数返回的是实际输出到字符串缓冲中的字符个数,包括null结束符。而snprintf函数返回的是应该输出到字符...
snprintf(buf, 5, "This is a test string."); // buf becomes "This", buf[4] is '\0' snprintf(buf, 6, "This is a test string."); // ERROR: buffer overflow snprintf(buf, 5, "abc"); // buf becomes "abc", the value of buf[3] is '\0', buf[4] is undefined. 然而,VC...
snprintf(buf, 5, "This is a test string."); // buf becomes "This", buf[4] is '\0' snprintf(buf, 6, "This is a test string."); // ERROR: buffer overflow snprintf(buf, 5, "abc"); // buf becomes "abc", the value of buf[3] is '\0', buf[4] is undefined. 然而,VC...
#include <stdio.h> int main() { char buffer[10]; int value = 12345; snprintf(buffer, sizeof(buffer), "%d", value); printf("%s\n", buffer); return 0; } 2. 检查缓冲区大小 在使用 sprintf 时,确保目标缓冲区的大小足够大,能够容纳格式化后的数据。 代码语言:txt 复制 #include <stdio.h...
EOVERFLOW In the UNIX03 mode, thesnprintforvsnprintfsubroutine is unsuccessful if the value of Number parameter is greater than the value ofINT_MAX. Note:The UNIX03 behavior is enabled, if the value of theXPG_SUS_ENVenvironment variable is set to ON. ...
The snprintf function is equivalent to fprintf, except that the output is written into an array (specified by argument s) rather than to a stream. If n is zero, nothing is written, and s may be a null pointer. Otherwise, output characters beyond the n-1st are discarded rather than ...
printf 系列 函数 根据 下述的 format 参数 生成 输出内容. printf 和 vprintf 函数 把 输出内容 写到 stdout, 即 标准输出流; fprintf 和 vfprintf 函数 把 输出内容 写到 给定的 stream 流; sprintf, snprintf, vsprintf 和 vsnprintf 函数 把 输出内容 存放到 字符串 str 中. ...
snprintf(char *str, size_tn, char const fmt, ...) { int ret; va_list ap; if((int)n < ) return (EOF vastart(ap, fmt); ret = ruby_vsnprintf(str, n, fmt, ap); _(ap); ret; typedef struct{ rb_printf_buffer
snprintf(&buf[blen], need fbuf, fval; blen += strlen(&buf[blen]); } break; } = FNONE; } sprint_exit RB_GC_GUARD(fmt); /* XXX - We cannotvalidate the number of arguments (digit style used. */
snprintf函数的返回值 snprintf函数的字符串缓冲 今天在项目中使用snprintf时遇到一个比较迷惑的问题,追根溯源了一下,在此对sprintf和snprintf进行一下对比分析。 因为sprintf可能导致缓冲区溢出问题而不被推荐使用,所以在项目中我一直优先选择使用snprintf函数,虽然会稍微麻烦那么一点点。这里就是sprintf和snprintf最主要的区...