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IABSD.fr/xenocara/xserver/os/xprintf.c
matthieu
- xserver/os/xprintf.c
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/** * @file * * @section DESCRIPTION * * These functions provide a portable implementation of the common (but not * yet universal) asprintf & vasprintf routines to allocate a buffer big * enough to sprintf the arguments to. The XNF variants terminate the server * if the allocation fails. */ /* * Copyright (c) 2004 Alexander Gottwald * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name(s) of the above copyright * holders shall not be used in advertising or otherwise to promote the sale, * use or other dealings in this Software without prior written authorization. */ /* * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ #ifdef HAVE_DIX_CONFIG_H #include <dix-config.h> #endif #include <X11/Xos.h> #include "os.h" #include <stdarg.h> #include <stdio.h> #include <errno.h> #include <string.h> #ifdef asprintf #undef asprintf #endif #ifdef vasprintf #undef vasprintf #endif #ifndef va_copy #ifdef __va_copy #define va_copy __va_copy #else #error "no working va_copy was found" #endif #endif /** * Varargs sprintf that allocates a string buffer the right size for * the pattern & data provided and prints the requested data to it. * * @param ret Pointer to which the newly allocated buffer is written * (contents undefined on error) * @param format printf style format string * @param va variable argument list * @return size of allocated buffer, or -1 on error. */ int Xvasprintf(char **ret, const char *_X_RESTRICT_KYWD format, va_list va) { #ifdef HAVE_VASPRINTF return vasprintf(ret, format, va); #else int size; va_list va2; va_copy(va2, va); size = vsnprintf(NULL, 0, format, va2); va_end(va2); *ret = malloc(size + 1); if (*ret == NULL) return -1; vsnprintf(*ret, size + 1, format, va); (*ret)[size] = 0; return size; #endif } #ifndef HAVE_VASPRINTF #define vasprintf Xvasprintf #endif /** * sprintf that allocates a string buffer the right size for * the pattern & data provided and prints the requested data to it. * * @param ret Pointer to which the newly allocated buffer is written * (contents undefined on error) * @param format printf style format string * @param ... arguments for specified format * @return size of allocated buffer, or -1 on error. */ int Xasprintf(char **ret, const char *_X_RESTRICT_KYWD format, ...) { int size; va_list va; va_start(va, format); size = vasprintf(ret, format, va); va_end(va); return size; } /** * Varargs sprintf that allocates a string buffer the right size for * the pattern & data provided and prints the requested data to it. * On failure, issues a FatalError message and aborts the server. * * @param ret Pointer to which the newly allocated buffer is written * (contents undefined on error) * @param format printf style format string * @param va variable argument list * @return size of allocated buffer */ int XNFvasprintf(char **ret, const char *_X_RESTRICT_KYWD format, va_list va) { int size = vasprintf(ret, format, va); if ((size == -1) || (*ret == NULL)) { FatalError("XNFvasprintf failed: %s", strerror(errno)); } return size; } /** * sprintf that allocates a string buffer the right size for * the pattern & data provided and prints the requested data to it. * On failure, issues a FatalError message and aborts the server. * * @param ret Pointer to which the newly allocated buffer is written * (contents undefined on error) * @param format printf style format string * @param ... arguments for specified format * @return size of allocated buffer */ int XNFasprintf(char **ret, const char *_X_RESTRICT_KYWD format, ...) { int size; va_list va; va_start(va, format); size = XNFvasprintf(ret, format, va); va_end(va); return size; } /** * Varargs snprintf that returns the actual number of bytes (excluding final * '\0') that were copied into the buffer. * This is opposed to the normal sprintf() usually returns the number of bytes * that would have been written. * * @param s buffer to copy into * @param n size of buffer s * @param format printf style format string * @param va variable argument list * @return number of bytes actually copied, excluding final '\0' */ int Xvscnprintf(char *s, int n, const char *format, va_list args) { int x; if (n == 0) return 0; x = vsnprintf(s, n , format, args); return (x >= n) ? (n - 1) : x; } /** * snprintf that returns the actual number of bytes (excluding final '\0') that * were copied into the buffer. * This is opposed to the normal sprintf() usually returns the number of bytes * that would have been written. * * @param s buffer to copy into * @param n size of buffer s * @param format printf style format string * @param ... arguments for specified format * @return number of bytes actually copied, excluding final '\0' */ int Xscnprintf(char *s, int n, const char *format, ...) { int x; va_list ap; va_start(ap, format); x = Xvscnprintf(s, n, format, ap); va_end(ap); return x; } /* Old api, now deprecated, may be removed in the future */ char * Xvprintf(const char *format, va_list va) { char *ret; if (vasprintf(&ret, format, va) == -1) ret = NULL; return ret; } char * Xprintf(const char *format, ...) { char *ret; va_list va; va_start(va, format); if (vasprintf(&ret, format, va) == -1) ret = NULL; va_end(va); return ret; } char * XNFvprintf(const char *format, va_list va) { char *ret; XNFvasprintf(&ret, format, va); return ret; } char * XNFprintf(const char *format, ...) { char *ret; va_list va; va_start(va, format); XNFvasprintf(&ret, format, va); va_end(va); return ret; }