Mail Archives: djgpp-workers/2008/03/04/08:32:13
Am Dienstag, 4. März 2008 09:48 schrieben Sie:
> Just a minor improvement.
[snip]
> Add "printf("Length = %d.\n", strlen);
> if( NULL != strbuf )
> {
> printf("strbuf = '%s'.\n", strbuf);
> free( strbuf );
> }
> else
> {
> printf("strbuf = NULL.\n");
> }" or similar code.
Thanks, a little bit more improved examples have been added.
Regards,
Juan M. Guerrero
2008-03-03 Juan Manuell Guerrero <juan DOT guerrero AT gmx DOT de>
* include/stdio.h: Declarartions for asprintf and vasprintf added.
* src/libc/compat/stdio/asprintf.c: BSD/GNU compatibility function.
* src/libc/compat/stdio/asprintf.txh: Info about asprintf.
* src/libc/compat/stdio/vasprintf.c: BSD/GNU compatibility function.
* src/libc/compat/stdio/vasprintf.txh: Info about vasprintf.
* src/docs/kb/wc204.txi: Info about asprintf and vasprintf added.
diff -aprNU3 djgpp.orig/include/stdio.h djgpp/include/stdio.h
--- djgpp.orig/include/stdio.h 2007-12-11 07:48:42 +0000
+++ djgpp/include/stdio.h 2008-03-04 14:11:50 +0000
@@ -164,6 +164,8 @@ int putw(int _v, FILE *_f);
void setbuffer(FILE *_f, void *_buf, int _size);
void setlinebuf(FILE *_f);
int _rename(const char *_old, const char *_new); /* Simple (no directory) */
+int asprintf(char **_sp, const char *_format, ...);
+int vasprintf(char **_sp, const char *_format, va_list _ap);
#ifndef _OFF_T
__DJ_off_t
diff -aprNU3 djgpp.orig/src/docs/kb/wc204.txi djgpp/src/docs/kb/wc204.txi
--- djgpp.orig/src/docs/kb/wc204.txi 2005-05-11 20:06:08 +0000
+++ djgpp/src/docs/kb/wc204.txi 2008-03-04 14:11:50 +0000
@@ -1094,3 +1094,8 @@ formats for @code{"%x"} and @code{"%X"}
@pindex djasm AT r{, cr4 register}
@code{djasm} recognises the fourth control register, @code{cr4}.
+
+@findex asprintf
+@findex vasprintf
+New BSD/GNU compatibility functions @code{asprintf} and @code{vasprintf} added.
+
diff -aprNU3 djgpp.orig/src/libc/compat/stdio/asprintf.c djgpp/src/libc/compat/stdio/asprintf.c
--- djgpp.orig/src/libc/compat/stdio/asprintf.c 1970-01-01 00:00:00 +0000
+++ djgpp/src/libc/compat/stdio/asprintf.c 2008-03-04 14:11:50 +0000
@@ -0,0 +1,42 @@
+/* Copyright (C) 2008 DJ Delorie, see COPYING.DJ for details */
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <libc/file.h>
+
+int
+asprintf(char **strp, const char *fmt, ...)
+{
+ va_list args;
+ FILE *_dev_null, _strbuf;
+ int len;
+
+ *strp = NULL;
+ _dev_null = fopen("/dev/null", "w");
+ if (_dev_null == NULL)
+ return EOF;
+
+ va_start(args, fmt);
+ len = _doprnt(fmt, args, _dev_null);
+ fclose(_dev_null);
+ if (len != EOF)
+ {
+ *strp = malloc(++len);
+ if (*strp)
+ {
+ __stropenw(&_strbuf, *strp, len);
+ len = _doprnt(fmt, args, &_strbuf);
+ __strclosew(&_strbuf);
+ if (len == EOF)
+ {
+ free(*strp);
+ *strp = NULL;
+ }
+ }
+ else
+ len = EOF;
+ }
+ va_end(args);
+
+ return len;
+}
diff -aprNU3 djgpp.orig/src/libc/compat/stdio/asprintf.txh djgpp/src/libc/compat/stdio/asprintf.txh
--- djgpp.orig/src/libc/compat/stdio/asprintf.txh 1970-01-01 00:00:00 +0000
+++ djgpp/src/libc/compat/stdio/asprintf.txh 2008-03-04 14:11:50 +0000
@@ -0,0 +1,52 @@
+@node asprintf, stdio
+@findex asprintf
+@subheading Syntax
+
+@example
+#include <stdio.h>
+
+int asprintf (char **@var{bufferp}, const char *@var{format},
+ @dots{});
+@end example
+
+@subheading Description
+
+Sends formatted output from the arguments (@dots{}) including
+the terminating null byte to the allocated buffer and returns
+a pointer to it via the first parameter *@var{bufferp}. This
+memory must be returned to the heap with @code{free} (@pxref{free}).
+This function is analog of @code{sprintf()} (@pxref{sprintf}).
+
+@subheading Return Value
+
+The number of characters that would have been written (excluding
+the terminating null byte) is returned; otherwise EOF is returned
+to flag encoding or buffer space errors and the pointer
+*@var{bufferp} is set to @code{NULL}.
+
+
+@subheading Portability
+
+@portability !ansi, !posix
+
+@subheading Example
+
+@example
+char *strbuf; /* Pointer to the allocated buffer by asprintf. */
+int strlen;
+long double pi = 3.1415926535897932384626433832795;
+
+strlen = asprintf(&strbuf, "Pi = %.15Lf\n", pi);
+
+if (EOF == strlen)
+ printf("error: asprintf failed.\n");
+else
+{
+ /*
+ * Your code using the allocated buffer by asprintf.
+ */
+ do_something(strbuf, strlen);
+
+ free(strbuf); /* You must release the memory allocated by asprintf. */
+}
+@end example
diff -aprNU3 djgpp.orig/src/libc/compat/stdio/makefile djgpp/src/libc/compat/stdio/makefile
--- djgpp.orig/src/libc/compat/stdio/makefile 2007-12-11 07:48:42 +0000
+++ djgpp/src/libc/compat/stdio/makefile 2008-03-04 14:11:50 +0000
@@ -2,6 +2,7 @@
# Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details
TOP=../..
+SRC += asprintf.c
SRC += fseeko.c
SRC += fseeko64.c
SRC += ftello.c
@@ -9,8 +10,9 @@ SRC += ftello64.c
SRC += mkstemp.c
SRC += mktemp.c
SRC += tempnam.c
-SRC += vscanf.c
+SRC += vasprintf.c
SRC += vfscanf.S
+SRC += vscanf.c
SRC += vsscanf.c
include $(TOP)/../makefile.inc
diff -aprNU3 djgpp.orig/src/libc/compat/stdio/vasprintf.c djgpp/src/libc/compat/stdio/vasprintf.c
--- djgpp.orig/src/libc/compat/stdio/vasprintf.c 1970-01-01 00:00:00 +0000
+++ djgpp/src/libc/compat/stdio/vasprintf.c 2008-03-04 14:11:50 +0000
@@ -0,0 +1,39 @@
+/* Copyright (C) 2008 DJ Delorie, see COPYING.DJ for details */
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <libc/file.h>
+
+int
+vasprintf(char **strp, const char *fmt, va_list argsp)
+{
+ FILE *_dev_null, _strbuf;
+ int len;
+
+ *strp = NULL;
+ _dev_null = fopen("/dev/null", "w");
+ if (_dev_null == NULL)
+ return EOF;
+
+ len = _doprnt(fmt, argsp, _dev_null);
+ fclose(_dev_null);
+ if (len != EOF)
+ {
+ *strp = malloc(++len);
+ if (*strp)
+ {
+ __stropenw(&_strbuf, *strp, len);
+ len = _doprnt(fmt, argsp, &_strbuf);
+ __strclosew(&_strbuf);
+ if (len == EOF)
+ {
+ free(*strp);
+ *strp = NULL;
+ }
+ }
+ else
+ len = EOF;
+ }
+
+ return len;
+}
diff -aprNU3 djgpp.orig/src/libc/compat/stdio/vasprintf.txh djgpp/src/libc/compat/stdio/vasprintf.txh
--- djgpp.orig/src/libc/compat/stdio/vasprintf.txh 1970-01-01 00:00:00 +0000
+++ djgpp/src/libc/compat/stdio/vasprintf.txh 2008-03-04 14:11:50 +0000
@@ -0,0 +1,54 @@
+@node vasprintf, stdio
+@findex vasprintf
+@subheading Syntax
+
+@example
+#include <stdio.h>
+#include <stdarg.h>
+
+int vasprintf (char **@var{bufferp}, const char *@var{format},
+ va_list @var{ap});
+@end example
+
+@subheading Description
+
+Sends formatted output from the arguments in (@var{ap}) including
+the terminating null byte to the allocated buffer and returns
+a pointer to it via the first parameter *@var{bufferp}. This
+memory must be returned to the heap with @code{free} (@pxref{free}).
+This function is analog of @code{vsprintf()} (@pxref{vsprintf}).
+
+@subheading Return Value
+
+The number of characters that would have been written (excluding
+the terminating null byte) is returned; otherwise EOF is returned
+to flag encoding or buffer space errors and the pointer
+*@var{bufferp} is set to @code{NULL}.
+
+
+@subheading Portability
+
+@portability !ansi, !posix
+
+@subheading Example
+
+@example
+char *strbuf; /* Pointer to the allocated buffer by vasprintf. */
+int strlen;
+
+strlen = vasprintf(&strbuf, "arg[0] = %s\n"
+ "arg[1] = %s\n"
+ "arg[2] = %s\n", arg_list);
+
+if (EOF == strlen)
+ printf("error: vasprintf failed.\n");
+else
+{
+ /*
+ * Your code using the allocated buffer by vasprintf.
+ */
+ do_something(strbuf, strlen);
+
+ free(strbuf); /* You must release the memory allocated by vasprintf. */
+}
+@end example
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