38 lines
636 B
C
38 lines
636 B
C
#include <stdio.h>
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#include <stdlib.h>
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#include <locale.h>
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#include <wchar.h>
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int main(int argc, char** argv)
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{
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FILE *fp;
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#ifdef UTF8
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setlocale(LC_ALL, "en_US.utf8");
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#else
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setlocale(LC_ALL, "en_US");
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#endif
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fp = fopen("output.txt", "w+");
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if (fp == NULL) {
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perror("fopen");
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exit(1);
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}
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if (fputws(L"abc\n", fp) == -1) {
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perror("fputws");
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exit(1);
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}
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printf("before=%d\n", ftell(fp));
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if (fseek(fp, 0L, SEEK_END) == -1) {
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perror("fseek");
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exit(1);
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}
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printf("fseek=%d\n", ftell(fp));
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if (fputws(L"xyz\n", fp) == -1) {
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perror("fputws");
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exit(1);
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}
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printf("after=%d\n", ftell(fp));
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fclose(fp);
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return 0;
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}
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