WebSVN – HelenOS – Diff – /trunk/uspace/lib/libc/generic/io/asprintf.c


/*
 * Copyright (c) 2006 Josef Cejka
 * Copyright (c) 2008 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup libc
 * @{
 */
/** @file
 */
 
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <io/printf_core.h>
 
static int asprintf_prewrite(const char *str, size_t count, void *unused)
{
    return count;
}
 
/** Allocate and print to string.
 *
 * @param strp      Address of the pointer where to store the address of
 *          the newly allocated string.
 * @fmt         Format strin.
 *
 * @return      Number of characters printed or a negative error code.
 */
int asprintf(char **strp, const char *fmt, ...)
{
    struct printf_spec ps = {
         asprintf_prewrite,
         NULL
    };
    int ret;
    va_list args;
 
    va_start(args, fmt);
    ret = printf_core(fmt, &ps, args);
    va_end(args);
    if (ret > 0) {
        *strp = malloc(ret + 20);
        if (!*strp)
            return -1;
        va_start(args, fmt);
        vsprintf(*strp, fmt, args);
        va_end(args);      
    }
 
    return ret;
}
 
/** @}
 */
 

Rev 3348	Rev 3351
1	/*	1	/*
2	* Copyright (c) 2006 Josef Cejka	2	* Copyright (c) 2006 Josef Cejka
3	* Copyright (c) 2008 Jakub Jermar	3	* Copyright (c) 2008 Jakub Jermar
4	* All rights reserved.	4	* All rights reserved.
5	*	5	*
6	* Redistribution and use in source and binary forms, with or without	6	* Redistribution and use in source and binary forms, with or without
7	* modification, are permitted provided that the following conditions	7	* modification, are permitted provided that the following conditions
8	* are met:	8	* are met:
9	*	9	*
10	* - Redistributions of source code must retain the above copyright	10	* - Redistributions of source code must retain the above copyright
11	* notice, this list of conditions and the following disclaimer.	11	* notice, this list of conditions and the following disclaimer.
12	* - Redistributions in binary form must reproduce the above copyright	12	* - Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the	13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the distribution.	14	* documentation and/or other materials provided with the distribution.
15	* - The name of the author may not be used to endorse or promote products	15	* - The name of the author may not be used to endorse or promote products
16	* derived from this software without specific prior written permission.	16	* derived from this software without specific prior written permission.
17	*	17	*
18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/	28	*/
29		29
30	/** @addtogroup libc	30	/** @addtogroup libc
31	* @{	31	* @{
32	*/	32	*/
33	/** @file	33	/** @file
34	*/	34	*/
35		35
36	#include <stdarg.h>	36	#include <stdarg.h>
37	#include <stdio.h>	37	#include <stdio.h>
38	#include <stdlib.h>	38	#include <stdlib.h>
39	#include <io/printf_core.h>	39	#include <io/printf_core.h>
40		40
41	static int asprintf_prewrite(const char str, size_t count, void unused)	41	static int asprintf_prewrite(const char str, size_t count, void unused)
42	{	42	{
43	return count;	43	return count;
44	}	44	}
45		45
-		46	/** Allocate and print to string.
-		47	*
-		48	* @param strp Address of the pointer where to store the address of
-		49	* the newly allocated string.
-		50	* @fmt Format strin.
-		51	*
-		52	* @return Number of characters printed or a negative error code.
-		53	*/
46	int asprintf(char *strp, const char fmt, ...)	54	int asprintf(char *strp, const char fmt, ...)
47	{	55	{
48	struct printf_spec ps = {	56	struct printf_spec ps = {
49	asprintf_prewrite,	57	asprintf_prewrite,
50	NULL	58	NULL
51	};	59	};
52	int ret;	60	int ret;
53	va_list args;	61	va_list args;
54		62
55	va_start(args, fmt);	63	va_start(args, fmt);
56	ret = printf_core(fmt, &ps, args);	64	ret = printf_core(fmt, &ps, args);
57	va_end(args);	65	va_end(args);
58	if (ret > 0) {	66	if (ret > 0) {
59	*strp = malloc(ret + 20);	67	*strp = malloc(ret + 20);
60	if (!*strp)	68	if (!*strp)
61	return -1;	69	return -1;
62	va_start(args, fmt);	70	va_start(args, fmt);
63	vsprintf(*strp, fmt, args);	71	vsprintf(*strp, fmt, args);
64	va_end(args);	72	va_end(args);
65	}	73	}
66		74
67	return ret;	75	return ret;
68	}	76	}
69		77
70	/** @}	78	/** @}
71	*/	79	*/
72		80

Subversion Repositories HelenOS

(root)/trunk/uspace/lib/libc/generic/io/asprintf.c – Rev 3348 → 3351