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lib/kasprintf.c
1.39 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* * linux/lib/kasprintf.c * * Copyright (C) 1991, 1992 Linus Torvalds */ #include <stdarg.h> |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> #include <linux/string.h> /* Simplified asprintf. */ char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap) { |
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unsigned int first, second; |
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char *p; va_list aq; va_copy(aq, ap); |
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first = vsnprintf(NULL, 0, fmt, aq); |
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va_end(aq); |
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p = kmalloc_track_caller(first+1, gfp); |
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if (!p) return NULL; |
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second = vsnprintf(p, first+1, fmt, ap); WARN(first != second, "different return values (%u and %u) from vsnprintf(\"%s\", ...)", first, second, fmt); |
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return p; } EXPORT_SYMBOL(kvasprintf); |
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/* * If fmt contains no % (or is exactly %s), use kstrdup_const. If fmt * (or the sole vararg) points to rodata, we will then save a memory * allocation and string copy. In any case, the return value should be * freed using kfree_const(). */ const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list ap) { if (!strchr(fmt, '%')) return kstrdup_const(fmt, gfp); if (!strcmp(fmt, "%s")) return kstrdup_const(va_arg(ap, const char*), gfp); return kvasprintf(gfp, fmt, ap); } EXPORT_SYMBOL(kvasprintf_const); |
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char *kasprintf(gfp_t gfp, const char *fmt, ...) { va_list ap; char *p; va_start(ap, fmt); p = kvasprintf(gfp, fmt, ap); va_end(ap); return p; } EXPORT_SYMBOL(kasprintf); |