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 #include "private/libc_logging.h" 12 13 struct Pair { 14 int code; 15 const char* msg; 16 }; 17 18 static const char* __code_string_lookup(const Pair* strings, int code) { 19 for (size_t i = 0; strings[i].msg != NULL; ++i) { 20 if (strings[i].code == code) { 21 return strings[i].msg; 22 } 23 } 24 return NULL; 25 } 26 27 static const Pair _sys_error_strings[] = { 28 #define __BIONIC_ERRDEF(x,y,z) { x, z }, 29 #include <sys/_errdefs.h> 30 { 0, NULL } 31 }; 32 33 extern "C" __LIBC_HIDDEN__ const char* __strerror_lookup(int error_number) { 34 return __code_string_lookup(_sys_error_strings, error_number); 35 } 36 37 static const Pair _sys_signal_strings[] = { 38 #define __BIONIC_SIGDEF(signal_number, signal_description) { signal_number, signal_description }, 39 #include <sys/_sigdefs.h> 40 { 0, NULL } 41 }; 42 43 extern "C" __LIBC_HIDDEN__ const char* __strsignal_lookup(int signal_number) { 44 return __code_string_lookup(_sys_signal_strings, signal_number); 45 } 46 47 int strerror_r(int error_number, char* buf, size_t buf_len) { 48 ErrnoRestorer errno_restorer; 49 size_t length; 50 51 const char* error_name = __strerror_lookup(error_number); 52 if (error_name != NULL) { 53 length = strlcpy(buf, error_name, buf_len); 54 } else { 55 length = __libc_format_buffer(buf, buf_len, "Unknown error %d", error_number); 56 } 57 if (length >= buf_len) { 58 errno_restorer.override(ERANGE); 59 return -1; 60 } 61 62 return 0; 63 } 64 65 extern "C" __LIBC_HIDDEN__ const char* __strsignal(int signal_number, char* buf, size_t buf_len) { 66 const char* signal_name = __strsignal_lookup(signal_number); 67 if (signal_name != NULL) { 68 return signal_name; 69 } 70 71 const char* prefix = "Unknown"; 72 if (signal_number >= SIGRTMIN && signal_number <= SIGRTMAX) { 73 prefix = "Real-time"; 74 signal_number -= SIGRTMIN; 75 } 76 size_t length = snprintf(buf, buf_len, "%s signal %d", prefix, signal_number); 77 if (length >= buf_len) { 78 return NULL; 79 } 80 return buf; 81 } 82
