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Make fseek support ungetc, fix non standard compliant behaviour

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3035 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2004-05-13 21:29:18 +00:00
parent 51752caa56
commit f36b52f2aa
1 changed files with 28 additions and 4 deletions
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32
libsrc/common/fseek.c
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@ -1,7 +1,8 @@
/* /*
* fseek.c * fseek.c
* *
* Christian Groessler, 07-Aug-2000 * Christian Groessler, 2000-08-07
* Ullrich von Bassewitz, 2004-05-12
*/ */
@ -11,7 +12,7 @@
#include <unistd.h> #include <unistd.h>
#include "_file.h" #include "_file.h"
/*****************************************************************************/ /*****************************************************************************/
/* Code */ /* Code */
@ -19,7 +20,7 @@
int __fastcall__ fseek (FILE* f, long offset, int whence) int __fastcall__ fseek (register FILE* f, long offset, int whence)
{ {
long res; long res;
@ -29,8 +30,31 @@ int __fastcall__ fseek (FILE* f, long offset, int whence)
return -1; return -1;
} }
/* If we have a pushed back character, and whence is relative to the
* current position, correct the offset.
*/
if ((f->f_flags & _FPUSHBACK) && whence == SEEK_CUR) {
--offset;
}
/* Do the seek */
res = lseek(f->f_fd, offset, whence); res = lseek(f->f_fd, offset, whence);
if (res == -1L) return -1;
/* If we had an error, set the error indicator on the stream, and
* return -1. We will check for < 0 here, because that saves some code,
* and we don't have files with 2 gigabytes in size anyway:-)
*/
if (res < 0) {
f->f_flags |= _FERROR;
return -1;
}
/* The seek was successful. Discard any effects of the ungetc function,
* and clear the end-of-file indicator.
*/
f->f_flags &= ~(_FEOF | _FPUSHBACK);
/* Done */
return 0; return 0;
} }