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 #include "debug.h" 11 12 static void report(const char *prefix, const char *err, va_list params) 13 { 14 char msg[1024]; 15 vsnprintf(msg, sizeof(msg), err, params); 16 fprintf(stderr, " %s%s\n", prefix, msg); 17 } 18 19 static __noreturn void usage_builtin(const char *err) 20 { 21 fprintf(stderr, "\n Usage: %s\n", err); 22 exit(129); 23 } 24 25 static __noreturn void die_builtin(const char *err, va_list params) 26 { 27 report(" Fatal: ", err, params); 28 exit(128); 29 } 30 31 static void error_builtin(const char *err, va_list params) 32 { 33 report(" Error: ", err, params); 34 } 35 36 /* If we are in a dlopen()ed .so write to a global variable would segfault 37 * (ugh), so keep things static. */ 38 static void (*usage_routine)(const char *err) __noreturn = usage_builtin; 39 static void (*error_routine)(const char *err, va_list params) = error_builtin; 40 41 void usage(const char *err) 42 { 43 usage_routine(err); 44 } 45 46 void die(const char *err, ...) 47 { 48 va_list params; 49 50 va_start(params, err); 51 die_builtin(err, params); 52 va_end(params); 53 } 54 55 int error(const char *err, ...) 56 { 57 va_list params; 58 59 va_start(params, err); 60 error_routine(err, params); 61 va_end(params); 62 return -1; 63 } 64