40 lines
833 B
C
40 lines
833 B
C
/* Tests that stdin can be redirected from a normal file. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int
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main (void)
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{
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const char* fname = "freopen.dat";
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const char tsttxt[]
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= "A random line of text, used to test correct freopen etc.\n";
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FILE* instream;
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FILE *old_stderr;
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char c1;
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/* Like the freopen call in flex. */
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old_stderr = freopen (fname, "w+", stderr);
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if (old_stderr == NULL
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|| fwrite (tsttxt, 1, strlen (tsttxt), stderr) != strlen (tsttxt)
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|| fclose (stderr) != 0)
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{
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printf ("fail\n");
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exit (1);
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}
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instream = freopen(fname, "r", stdin);
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if (instream == NULL) {
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printf("fail\n");
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exit(1);
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}
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c1 = getc(instream);
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if (c1 != 'A') {
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printf("fail\n");
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exit(1);
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}
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printf ("pass\n");
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exit(0);
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}
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