VisionFive2 Linux kernel

b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100  1) // SPDX-License-Identifier: GPL-2.0
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700  2) /*
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700  3)  *  linux/lib/kasprintf.c
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700  4)  *
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700  5)  *  Copyright (C) 1991, 1992  Linus Torvalds
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700  6)  */
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700  7) 
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700  8) #include <stdarg.h>
8bc3bcc93a2b4 (Paul Gortmaker     2011-11-16 21:29:17 -0500  9) #include <linux/export.h>
5a0e3ad6af866 (Tejun Heo          2010-03-24 17:04:11 +0900 10) #include <linux/slab.h>
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 11) #include <linux/types.h>
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 12) #include <linux/string.h>
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 13) 
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 14) /* Simplified asprintf. */
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 15) char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 16) {
8e2a2bfdb86ec (Rasmus Villemoes   2016-01-15 16:58:47 -0800 17) 	unsigned int first, second;
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 18) 	char *p;
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 19) 	va_list aq;
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 20) 
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 21) 	va_copy(aq, ap);
8e2a2bfdb86ec (Rasmus Villemoes   2016-01-15 16:58:47 -0800 22) 	first = vsnprintf(NULL, 0, fmt, aq);
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 23) 	va_end(aq);
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 24) 
8e2a2bfdb86ec (Rasmus Villemoes   2016-01-15 16:58:47 -0800 25) 	p = kmalloc_track_caller(first+1, gfp);
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 26) 	if (!p)
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 27) 		return NULL;
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 28) 
8e2a2bfdb86ec (Rasmus Villemoes   2016-01-15 16:58:47 -0800 29) 	second = vsnprintf(p, first+1, fmt, ap);
8e2a2bfdb86ec (Rasmus Villemoes   2016-01-15 16:58:47 -0800 30) 	WARN(first != second, "different return values (%u and %u) from vsnprintf(\"%s\", ...)",
8e2a2bfdb86ec (Rasmus Villemoes   2016-01-15 16:58:47 -0800 31) 	     first, second, fmt);
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 32) 
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 33) 	return p;
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 34) }
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 35) EXPORT_SYMBOL(kvasprintf);
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 36) 
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 37) /*
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 38)  * If fmt contains no % (or is exactly %s), use kstrdup_const. If fmt
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 39)  * (or the sole vararg) points to rodata, we will then save a memory
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 40)  * allocation and string copy. In any case, the return value should be
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 41)  * freed using kfree_const().
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 42)  */
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 43) const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list ap)
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 44) {
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 45) 	if (!strchr(fmt, '%'))
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 46) 		return kstrdup_const(fmt, gfp);
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 47) 	if (!strcmp(fmt, "%s"))
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 48) 		return kstrdup_const(va_arg(ap, const char*), gfp);
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 49) 	return kvasprintf(gfp, fmt, ap);
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 50) }
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 51) EXPORT_SYMBOL(kvasprintf_const);
0a9df786a6ae2 (Rasmus Villemoes   2015-11-06 16:31:20 -0800 52) 
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 53) char *kasprintf(gfp_t gfp, const char *fmt, ...)
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 54) {
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 55) 	va_list ap;
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 56) 	char *p;
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 57) 
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 58) 	va_start(ap, fmt);
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 59) 	p = kvasprintf(gfp, fmt, ap);
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 60) 	va_end(ap);
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 61) 
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 62) 	return p;
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 63) }
96e3e18eed3b4 (Sam Ravnborg       2007-07-31 00:38:13 -0700 64) EXPORT_SYMBOL(kasprintf);