回想一下使用fopen的套路if ( (fp = fopen(...)) == NULL) { 读取errno },fopen在出错时会返回NULL,因此我们知道需要读errno,但strtol在成功调用时也可能返回0x7fffffff,我们如何知道需要读errno呢?最严谨的做法是首先把errno置0,再调用strtol,再查看errno是否变成了错误码。ManPage上有一个很好的例子: strt...
回想一下使用fopen的套路if ( (fp = fopen(...)) == NULL) { 读取errno },fopen在出错时会返回NULL,因此我们知道需要读errno,但strtol在成功调用时也可能返回0x7fffffff,我们如何知道需要读errno呢?最严谨的做法是首先把errno置0,再调用strtol,再查看errno是否变成了错误码。ManPage上有一个很好的例子: strt...
Warning: the conversion may overflow in various ways. Conversion is totally outsourced to strtol(), see the associated man page for overflow handling. Credits: Thanks to A. Becker for suggesting strtol() */ /*---*/ int iniparser_getint(dictionary * d, const char * key, int notfound) ...
最严谨的做法是首先把errno置0,再调用strtol,再查看errno是否变成了错误码。Man Page上有一个很好的例子: 例25.10. strtol的出错处理 #include <stdlib.h> #include <limits.h> #include <stdio.h> #include <errno.h> int main(int argc, char *argv[]) { int base; char *endptr, *str; long val...
» man pages section 3: Basic Library Functions » Basic Library Functions » ctermid Updated: July 2014man pages section 3: Basic Library Functions Document Information Using This Documentation Basic Library Functions __fbufsize(3C) __flbf(3C) __fpending(3C) __fpurge(3C) __freadable(...
did not work as documented on the man page: it did nothing, instead of removing "diag.com" as a search domain. Furthermore, using the command resolvectl domain eth0 "invalid" appeared to override the old configuration (at the expense of configuring a non-working search domain), but this...
From the scanf man page: RETURN VALUE The returned value of these functions indicates the count of input items that have been successfully matched and assigned. This count may be less than the number of items provided or can be zero if there is an early matching failure. ...
totally outsourced to strtol(), see the associated man page for overflow handling. Credits: Thanks to A. Becker for suggesting strtol() */ /*---*/ int iniparser_getint(const dictionary * d, const char * key, int notfound) { return (int)iniparser_getlongint(d, key, notfou...
{ enum strtol_error e = human_options (optarg, &human_output_opts, &output_block_size); if (e != LONGINT_OK) xstrtol_fatal (e, oi, c, long_options, optarg); } break; case 'i': if (header_mode == OUTPUT_MODE) { error (0, 0, msg_mut_excl, "-i", "--output"); ...
man sscanf：%d在C或glibc中被弃用？为什么%d被弃用？似乎所有的int说明符都被弃用了。它们并没有被...