1 /* 2 * usage.c 3 * 4 * Various reporting routines. 5 * Originally copied from GIT source. 6 * 7 * Copyright (C) Linus Torvalds, 2005 8 */ 9 #include "util.h" 10 11 static void report(const char *prefix, const char *err, va_list params) 12 { 13 char msg[1024]; 14 vsnprintf(msg, sizeof(msg), err, params); 15 fprintf(stderr, " %s%s\n", prefix, msg); 16 } 17 18 static NORETURN void usage_builtin(const char *err) 19 { 20 fprintf(stderr, "\n Usage: %s\n", err); 21 exit(129); 22 } 23 24 static NORETURN void die_builtin(const char *err, va_list params) 25 { 26 report(" Fatal: ", err, params); 27 exit(128); 28 } 29 30 static void error_builtin(const char *err, va_list params) 31 { 32 report(" Error: ", err, params); 33 } 34 35 static void warn_builtin(const char *warn, va_list params) 36 { 37 report(" Warning: ", warn, params); 38 } 39 40 /* If we are in a dlopen()ed .so write to a global variable would segfault 41 * (ugh), so keep things static. */ 42 static void (*usage_routine)(const char *err) NORETURN = usage_builtin; 43 static void (*die_routine)(const char *err, va_list params) NORETURN = die_builtin; 44 static void (*error_routine)(const char *err, va_list params) = error_builtin; 45 static void (*warn_routine)(const char *err, va_list params) = warn_builtin; 46 47 void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN) 48 { 49 die_routine = routine; 50 } 51 52 void usage(const char *err) 53 { 54 usage_routine(err); 55 } 56 57 void die(const char *err, ...) 58 { 59 va_list params; 60 61 va_start(params, err); 62 die_routine(err, params); 63 va_end(params); 64 } 65 66 int error(const char *err, ...) 67 { 68 va_list params; 69 70 va_start(params, err); 71 error_routine(err, params); 72 va_end(params); 73 return -1; 74 } 75 76 void warning(const char *warn, ...) 77 { 78 va_list params; 79 80 va_start(params, warn); 81 warn_routine(warn, params); 82 va_end(params); 83 } 84