Cider Isn't Darwin Emulation, Really
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123/* * Copyright (c) 2010 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */
#include "string.h"
static const char hex[] = "0123456789abcdef";
static int_mach_strlen(const char *str){ const char *p; for (p = str; p; p++) { if (*p == '\0') { return (int)(p - str); } } /* NOTREACHED */ return 0;}
static void_mach_hex(char **buffer, int *length, unsigned long long n){ char buf[32]; char *cp = buf + sizeof(buf);
if (n) { *--cp = '\0'; while (n) { *--cp = hex[n & 0xf]; n >>= 4; }
int width = _mach_strlen(cp); while (width > 0 && length > 0) { *(*buffer)++ = *cp++; (*length)--; width--; } }}
int_mach_vsnprintf(char *buffer, int length, const char *fmt, va_list ap){ int width, max = length; char *out_ptr = buffer;
// we only ever write n-1 bytes so we can put a \0 at the end length--; while (length > 0 && *fmt) { if (*fmt == '\0') { break; } if (*fmt != '%') { *(out_ptr++) = *(fmt++); length--; continue; } fmt++; // only going to support a specific subset of sprintf flags // namely %s, %x, with no padding modifiers switch (*fmt++) { case 's': { char *cp = va_arg(ap, char*); width = _mach_strlen(cp); while (width > 0 && length > 0) { *(out_ptr++) = *(cp++); width--; length--; } break; } case 'x': { _mach_hex(&out_ptr, &length, va_arg(ap, unsigned int)); break; } } } if (max > 0) { *out_ptr = '\0'; } return max - (length + 1); /* don't include the final NULL in the return value */}
int_mach_snprintf(char *buffer, int length, const char *fmt, ...){ int ret; va_list ap; va_start(ap, fmt); ret = _mach_vsnprintf(buffer, length, fmt, ap); va_end(ap); return ret;}