kaguya
40 lines
840 B
C
40 lines
840 B
C
#include <stdio.h>
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#include <assert.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#define TEST_FILE "fdopen.tmp"
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int main() {
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int fd = open(TEST_FILE, O_CREAT | O_RDWR, 0666);
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assert(fd >= 0);
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char *str = "mlibc fdopen test";
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assert(write(fd, str, strlen(str)));
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// Seek to the beginning, then reopen with fdopen in append mode.
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lseek(fd, 0, SEEK_SET);
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FILE *file = fdopen(fd, "a");
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assert(file);
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// Append and close.
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str = " appended";
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fwrite(str, strlen(str), 1, file);
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fflush(file);
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fclose(file);
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// Open it again and check that the append succeeded.
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fd = open(TEST_FILE, O_RDONLY);
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assert(fd >= 0);
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file = fdopen(fd, "r");
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assert(file);
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str = "mlibc fdopen test appended";
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char buf[100] = {0};
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assert(fread(buf, 1, strlen(str), file));
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assert(!strcmp(buf, str));
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fclose(file);
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return 0;
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}
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