| On Thu, Nov 16, 2000 at 12:51:05PM +0100, Akim Demaille wrote:
| :
| : | -[FILE *f = fopen ("conftestval", "w");
| : | +[FILE *f = fopen ("conftestval", "wb");
| :
| : Portable?
|
| Not really my cup of tea, but (from fopen(3) on Linux):
|
| # The mode string can also include the letter ``b'' either as a third
| # character or as a char acter between the characters in any of the
| # two-character strings described above. This is strictly for
| # compatibility with ANSI C3.159-1989 (``ANSI C'') and has no effect;
| # the ``b'' is ignored.
Does anybody know whether using fopen (foo, "wb") is portable? Gary
uses a test for this, but I don't know if it's really needed. A grep
on the packages I have at hand show this:
gawk/gawk-3.1.84/pc/popen.c: if ( ((fp = fopen(p, "wb")) == NULL) || (fwrite(command,
1, i, fp) < i)
gawk/pc/popen.c: if ( ((fp = fopen(p, "wb")) == NULL) || (fwrite(command, 1, i, fp) <
i)
This seems to be for pc only, so no information.
libc/gmon/bb_exit_func.c: fp = fopen (OUT_NAME, "wb");
libc/nis/nis_file.c: out = fopen (cold_start_file, "wb");
libc/nis/nis_file.c: out = fopen (name, "wb");
libc/timezone/zic.c: if ((fp = fopen(fullname, "wb")) == NULL) {
libc/timezone/zic.c: if ((fp = fopen(fullname, "wb")) == NULL) {
Since the libc comes with its own fopen, we learn nothing.
libppd-0.4/pstops.c:
if((temp=fopen(cupsTempFile(tempfile,sizeof(tempfile)),"wb+"))==NULL){
I'm not sure this lib is really portable.
Jim has this in the textutils:
tu/src/md5sum.c: fp = fopen (filename, OPENOPTS (binary));
with
/* Most systems do not distinguish between external and internal
text representations. */
/* FIXME: This begs for an autoconf test. */
#if O_BINARY
# define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
# define TEXT1TO1 "rb"
# define TEXTCNVT "r"
#else
# if defined VMS
# define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
# define TEXT1TO1 "rb", "ctx=stm"
# define TEXTCNVT "r", "ctx=stm"
# else
# if UNIX || __UNIX__ || unix || __unix__ || _POSIX_VERSION
# define OPENOPTS(BINARY) "r"
# else
/* The following line is intended to evoke an error.
Using #error is not portable enough. */
"Cannot determine system type."
# endif
# endif
#endif
