1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2025 Hans Rosenfeld 24 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 /* Copyright (c) 1988 AT&T */ 29 /* All Rights Reserved */ 30 31 #include "lint.h" 32 #include <mtlib.h> 33 #include <stdarg.h> 34 #include <values.h> 35 #include <errno.h> 36 #include <synch.h> 37 #include <thread.h> 38 #include <sys/types.h> 39 #include "print.h" 40 #include "libc.h" 41 #include <stdio_ext.h> 42 #include <upanic.h> 43 44 #ifdef _C89_INTMAX32 45 /* 46 * 32-bit shadow function of vsprintf() and sprintf() are built here. 47 * When using the c89 compiler to build 32-bit applications, the size 48 * of intmax_t is 32-bits, otherwise the size of intmax_t is 64-bits. 49 * The shadow function uses 32-bit size of intmax_t for %j conversion. 50 * The #pragma redefine_extname in <stdio.h> selects the proper routine 51 * at compile time for the user application. 52 * NOTE: these functions are only available in the 32-bit library. 53 */ 54 #pragma redefine_extname vsprintf _vsprintf_c89 55 #pragma redefine_extname sprintf _sprintf_c89 56 #endif 57 58 int 59 vsprintf(char *string, const char *format, va_list ap) 60 { 61 ssize_t count; 62 FILE siop; 63 64 /* 65 * The dummy FILE * created for vsprintf has the _IOREAD 66 * flag set to distinguish it from printf and fprintf 67 * invocations. It also has the _IOWRT flag set to indicate 68 * it is writable, which is checked later by vfprintf(). 69 */ 70 siop._flag = _IOWRT | _IOREAD; 71 siop._cnt = MAXINT; 72 siop._base = siop._ptr = (unsigned char *)string; 73 74 /* 75 * Mark the dummy FILE so that no locking is ever done. 76 */ 77 if (__fsetlocking(&siop, FSETLOCKING_BYCALLER) == -1) 78 upanic(NULL, 0); /* this should never happen */ 79 80 count = vfprintf(&siop, format, ap); 81 82 *siop._ptr = '\0'; /* plant terminating null character */ 83 84 return ((int)count); 85 } 86 87 int 88 sprintf(char *string, const char *format, ...) 89 { 90 int count; 91 va_list ap; 92 93 va_start(ap, format); 94 count = vsprintf(string, format, ap); 95 va_end(ap); 96 97 return (count); 98 } 99