1 /* $OpenBSD: strerror_r.c,v 1.6 2005/08/08 08:05:37 espie Exp $ */ 2 /* Public Domain <marc (at) snafu.org> */ 3 4 #include <errno.h> 5 #include <limits.h> 6 #include <signal.h> 7 #include <stdio.h> 8 #include <string.h> 9 10 #include "private/ErrnoRestorer.h" 11 12 struct Pair { 13 int code; 14 const char* msg; 15 }; 16 17 static const char* __code_string_lookup(const Pair* strings, int code) { 18 for (size_t i = 0; strings[i].msg != NULL; ++i) { 19 if (strings[i].code == code) { 20 return strings[i].msg; 21 } 22 } 23 return NULL; 24 } 25 26 static const Pair _sys_error_strings[] = { 27 #define __BIONIC_ERRDEF(x,y,z) { x, z }, 28 #include <sys/_errdefs.h> 29 { 0, NULL } 30 }; 31 32 extern "C" __LIBC_HIDDEN__ const char* __strerror_lookup(int error_number) { 33 return __code_string_lookup(_sys_error_strings, error_number); 34 } 35 36 static const Pair _sys_signal_strings[] = { 37 #define __BIONIC_SIGDEF(x,y,z) { y, z }, 38 #include <sys/_sigdefs.h> 39 { 0, NULL } 40 }; 41 42 extern "C" __LIBC_HIDDEN__ const char* __strsignal_lookup(int signal_number) { 43 return __code_string_lookup(_sys_signal_strings, signal_number); 44 } 45 46 int strerror_r(int error_number, char* buf, size_t buf_len) { 47 ErrnoRestorer errno_restorer; 48 size_t length; 49 50 const char* error_name = __strerror_lookup(error_number); 51 if (error_name != NULL) { 52 length = snprintf(buf, buf_len, "%s", error_name); 53 } else { 54 length = snprintf(buf, buf_len, "Unknown error %d", error_number); 55 } 56 if (length >= buf_len) { 57 errno_restorer.override(ERANGE); 58 return -1; 59 } 60 61 return 0; 62 } 63 64 extern "C" __LIBC_HIDDEN__ const char* __strsignal(int signal_number, char* buf, size_t buf_len) { 65 const char* signal_name = __strsignal_lookup(signal_number); 66 if (signal_name != NULL) { 67 return signal_name; 68 } 69 70 const char* prefix = "Unknown"; 71 if (signal_number >= SIGRTMIN && signal_number <= SIGRTMAX) { 72 prefix = "Real-time"; 73 signal_number -= SIGRTMIN; 74 } 75 size_t length = snprintf(buf, buf_len, "%s signal %d", prefix, signal_number); 76 if (length >= buf_len) { 77 return NULL; 78 } 79 return buf; 80 } 81
