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plurals

PO
primarykey
Id
2113927
data
AcceptedAnswerId
0
AnswerCount
0
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1
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CreationDate
2010-01-21T23:53:43.337
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0
LastActivityDate
2010-01-22T00:18:07.367
LastEditDate
2010-01-22T00:18:07.367
LastEditorUserId
20713
OwnerUserId
20713
ParentId
2113539
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
You could make an autoconf test, if you're using autotools for your buildsystem. <pre><code>AC_LANG([C]) AC_USE_SYSTEM_EXTENSIONS AC_ARG_WITH([dprintf], [AS_HELP_STRING([--with-dprintf], [Assume that dprintf prints to a specified file descriptor])], [], [with_dprintf=check]) AS_IF([test "x$with_dprintf" = xcheck], [AC_RUN_IFELSE( [AC_LANG_PROGRAM([[ #include <stdio.h> #include <string.h> int debug_level; ]], [[ char msg[] = "Hello, world!\n"; char rcv[sizeof(msg)] = ""; FILE *f = tmpfile(); int fd = fileno(f); debug_level = fd - 1; dprintf(fd, "%s", msg); fseek(f, 0, SEEK_SET); fread(rcv, 1, sizeof(msg), f); return strcmp(msg, rcv); ]] )], [with_dprintf=yes])]) AS_IF([test "x$with_dprintf" = xyes], [AC_DEFINE([HAVE_DPRINTF], [1], [dprintf prints to a specified file descriptor])]) </code></pre> (Allowing for <code>--with-dprintf</code> or <code>--without-dprintf</code> when cross-compiling, as <code>AC_RUN_IFELSE</code> isn't valid in those cases.) <hr> <a href="http://opengroup.org/onlinepubs/007908775/xsh/fdopen.html" rel="nofollow noreferrer">fdopen</a> isn't in standard C, but it is in POSIX.2 and later. I don't recall any UNIX-like that doesn't have it -- heck, even Windows has it. <pre><code>int fdprintf(int fd, char *fmt, ...) { va_list ap; FILE *f = fdopen(fd); int rc; va_start(ap, &fmt); rc = vfprintf(f, fmt, ap); fclose(f); va_end(ap); return rc; } </code></pre> Of course, if you know which file descriptor you'll be printing to, just keep the <code>FILE*</code> pointer around instead.
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1. POCross-platform compatibility of dprintf
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1. COI don't have a build system (OK, I'm using make via the make-remaking-make files thing)
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