From a9baddd7d07b9fe15e212985a808a79773ec72e4 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 19 Mar 2011 22:26:06 -0400 Subject: initial check-in, taken from old libc svn repo with significant additions --- ungetc.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 ungetc.c (limited to 'ungetc.c') diff --git a/ungetc.c b/ungetc.c new file mode 100644 index 0000000..070ad92 --- /dev/null +++ b/ungetc.c @@ -0,0 +1,55 @@ +#include +#include +#include +#include +#include + +#define TEST(r, f, x, m) ( \ +((r) = (f)) == (x) || \ +(printf(__FILE__ ":%d: %s failed (" m ")\n", __LINE__, #f, r, x, strerror(errno)), err++, 0) ) + +#define TEST_S(s, x, m) ( \ +!strcmp((s),(x)) || \ +(printf(__FILE__ ":%d: [%s] != [%s] (%s)\n", __LINE__, s, x, m), err++, 0) ) + +int test_ungetc(void) +{ + int i; + int err=0; + char a[100], b[100], *s; + FILE *f; + + TEST(i, !(f = tmpfile()), 0, "failed to create temp file %d!=%d (%s)"); + + if (!f) return err; + + errno=0; + TEST(i, fprintf(f, "hello, world\n"), 13, "%d != %d (%m)"); + TEST(i, fseek(f, 0, SEEK_SET), 0, "%d != %d (%m)"); + + TEST(i, feof(f), 0, "%d != %d"); + TEST(i, fgetc(f), 'h', "'%c' != '%c'"); + TEST(i, ftell(f), 1, "%d != %d"); + TEST(i, ungetc('x', f), 'x', "%d != %d"); + TEST(i, ftell(f), 0, "%d != %d"); + TEST(i, fscanf(f, "%[h]", a), 0, "got %d fields, expected %d"); + TEST(i, ftell(f), 0, "%d != %d"); + TEST(i, fgetc(f), 'x', "'%c' != '%c'"); + TEST(i, ftell(f), 1, "%d != %d"); + + TEST(i, fseek(f, 0, SEEK_SET), 0, "%d != %d"); + TEST(i, ungetc('x', f), 'x', "%d != %d"); + TEST(i, fread(a, 1, sizeof a, f), 14, "read %d, expected %d"); + a[14] = 0; + TEST_S(a, "xhello, world\n", "mismatch reading ungot character"); + + TEST(i, fseek(f, 0, SEEK_SET), 0, "%d != %d"); + TEST(i, fscanf(f, "%[x]", a), 0, "got %d fields, expected %d"); + TEST(i, ungetc('x', f), 'x', "unget failed after fscanf: %d != %d"); + TEST(i, fgetc(f), 'x', "'%c' != '%c'"); + TEST(i, fgetc(f), 'h', "'%c' != '%c'"); + + fclose(f); + + return err; +} -- cgit v1.2.1