1 /* 2 * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr (at) gmail.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "tests.h" 29 #include <stdio.h> 30 31 enum sprintrc_fmt { 32 SPRINTRC_FMT_RAW, 33 SPRINTRC_FMT_GREP, 34 }; 35 36 /** 37 * Provides pointer to static string buffer with printed return code in format 38 * used by strace - with errno and error message. 39 * 40 * @param rc Return code. 41 * @param fmt Output format. Currently, raw (used for diff matching) and grep 42 * (for extended POSIX regex-based pattern matching) formats are 43 * supported. 44 * @return Pointer to (statically allocated) buffer containing decimal 45 * representation of return code and errno/error message in case @rc 46 * is equal to -1. 47 */ 48 static inline const char * 49 sprintrc_ex(long rc, enum sprintrc_fmt fmt) 50 { 51 static const char *formats[] = { 52 [SPRINTRC_FMT_RAW] = "-1 %s (%m)", 53 [SPRINTRC_FMT_GREP] = "-1 %s \\(%m\\)", 54 }; 55 static char buf[4096]; 56 57 if (fmt >= ARRAY_SIZE(formats)) 58 perror_msg_and_fail("sprintrc_ex: incorrect format provided"); 59 60 if (rc == 0) 61 return "0"; 62 63 int ret = (rc == -1) 64 ? snprintf(buf, sizeof(buf), formats[fmt], errno2name()) 65 : snprintf(buf, sizeof(buf), "%ld", rc); 66 67 if (ret < 0) 68 perror_msg_and_fail("snprintf"); 69 if ((size_t) ret >= sizeof(buf)) 70 error_msg_and_fail("snprintf overflow: got %d, expected" 71 " no more than %zu", ret, sizeof(buf)); 72 73 return buf; 74 } 75 76 const char * 77 sprintrc(long rc) 78 { 79 return sprintrc_ex(rc, SPRINTRC_FMT_RAW); 80 } 81 82 const char * 83 sprintrc_grep(long rc) 84 { 85 return sprintrc_ex(rc, SPRINTRC_FMT_GREP); 86 } 87
