#define _POSIX_C_SOURCE 200112L // 为 GCC 的 setenv
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#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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#include <libgen.h>
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int main(void)
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{
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char *strFileName = "/home/basic/wk/basic/test/test_time.c";
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char *dir = dirname(strdup(strFileName) );
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printf("dir = %s\n", dir);
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char *dirc, *basec, *bname, *dname;
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char *path = "/home/basic/wk/basic/test/test_time.c";
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dirc = strdup(path);
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basec = strdup(path);
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dname = dirname(dirc);
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bname = basename(basec);
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printf("dirname=%s, basename=%s\n", dname, bname);
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// setenv("TZ", "/usr/share/zoneinfo/America/New_York", 1); // POSIX 限定
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// struct tm tm = *localtime(&(time_t){time(NULL)});
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// printf("%d\n", tm.tm_year);
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// printf("Today is %s", asctime(&tm));
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// printf("(DST is %s)\n", tm.tm_isdst ? "in effect" : "not in effect");
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// tm.tm_mon -= 100; // tm_mon 落在正常范围外
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// mktime(&tm); // tm_dst 不被设为 -1 ；使用今日的 DST 状态
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// printf("100 months ago was %s", asctime(&tm));
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// printf("(DST was %s)\n", tm.tm_isdst ? "in effect" : "not in effect");
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}
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