Blame src/stdio/ungetc.c

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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <unistd.h>
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#include "test.h"
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#define TEST(r, f, x, m) ( \
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	errno = 0, ((r) = (f)) == (x) || \
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	(error("%s failed (" m ")\n", #f, r, x, strerror(errno)), 0) )
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#define TEST_S(s, x, m) ( \
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	!strcmp((s),(x)) || \
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	(error("[%s] != [%s] (%s)\n", s, x, m), 0) )
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int main(void)
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{
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	int i;
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	char a[100];
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	FILE *f;
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	TEST(i, !(f = tmpfile()), 0, "failed to create temp file %d!=%d (%s)");
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	if (!f) return test_status;
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	TEST(i, fprintf(f, "hello, world\n"), 13, "%d != %d (%m)");
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	TEST(i, fseek(f, 0, SEEK_SET), 0, "%d != %d (%m)");
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	TEST(i, feof(f), 0, "%d != %d");
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	TEST(i, fgetc(f), 'h', "'%c' != '%c'");
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	TEST(i, ftell(f), 1, "%d != %d");
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	TEST(i, ungetc('x', f), 'x', "%d != %d");
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	TEST(i, ftell(f), 0, "%d != %d");
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	TEST(i, fscanf(f, "%[h]", a), 0, "got %d fields, expected %d");
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	TEST(i, ftell(f), 0, "%d != %d");
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	TEST(i, fgetc(f), 'x', "'%c' != '%c'");
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	TEST(i, ftell(f), 1, "%d != %d");
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	TEST(i, fseek(f, 0, SEEK_SET), 0, "%d != %d");
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	TEST(i, ungetc('x', f), 'x', "%d != %d");
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	TEST(i, fread(a, 1, sizeof a, f), 14, "read %d, expected %d");
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	a[14] = 0;
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	TEST_S(a, "xhello, world\n", "mismatch reading ungot character");
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	TEST(i, fseek(f, 0, SEEK_SET), 0, "%d != %d");
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	TEST(i, fscanf(f, "%[x]", a), 0, "got %d fields, expected %d");
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	TEST(i, ungetc('x', f), 'x', "unget failed after fscanf: %d != %d");
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	TEST(i, fgetc(f), 'x', "'%c' != '%c'");
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	TEST(i, fgetc(f), 'h', "'%c' != '%c'");
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	fclose(f);
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	return test_status;
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}