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/* errf.c -- formatted error messages */ |
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|
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/* Copyright 1992 Godfrey Paul, University of Kent at Canterbury. |
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* |
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* You can do what you like with this source code as long as |
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* you don't try to make money out of it and you include an |
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* unaltered copy of this message (including the copyright). |
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*/ |
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|
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char ukcprog_errf_sccsid[] = "$Id: errf.c,v 1.16 1995/11/26 16:05:56 mtr Exp $ UKC"; |
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|
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#ifdef __STDC__ |
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#include <stdarg.h> |
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#else |
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#include <varargs.h> |
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#endif |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#include "ukcprog.h" |
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|
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static const char *munge_progname PROTO((const char *)); |
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static void default_ofunc PROTO((const char *str)); |
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|
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static errf_ofunc_t User_errf_ofunc = default_ofunc; |
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static const char *Output_prefix = ""; |
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static char *Progname = NULL; |
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|
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static void |
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default_ofunc(str) |
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const char *str; |
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{ |
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fprintf(stderr, "%s%s\n", Output_prefix, str); |
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fflush(stderr); |
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} |
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|
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errf_ofunc_t |
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errf_set_ofunc(func) |
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errf_ofunc_t func; |
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{ |
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errf_ofunc_t old; |
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|
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if (func == NULL) |
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func = default_ofunc; |
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|
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old = User_errf_ofunc; |
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User_errf_ofunc = func; |
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|
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return old; |
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} |
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|
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|
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/* errf_set_prefix() |
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* Sets the string that errf() prefixes to messages. |
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* Returns the old one. |
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*/ |
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const char * |
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errf_set_prefix(prefix) |
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const char *prefix; |
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{ |
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const char *old; |
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|
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old = Output_prefix; |
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Output_prefix = prefix; |
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|
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return old; |
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} |
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|
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|
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/* errf_get_prefix() |
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* Return the current prefix. |
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*/ |
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const char * |
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errf_get_prefix() |
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{ |
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return Output_prefix; |
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} |
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|
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|
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static const char * |
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munge_progname(progname) |
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const char *progname; |
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{ |
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#ifdef VMS |
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const char *name, *dot; |
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char *s; |
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int i; |
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|
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if ((name = strrchr(progname, ']')) == NULL) |
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name = progname; |
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else |
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++name; |
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|
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if ((dot = strchr(name, '.')) == NULL) |
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dot = name + strlen(name); |
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|
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s = strf("%.*s", dot - name, name); |
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|
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for (i = 0; i < dot - name; ++i) |
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s[i] = toupper(s[i]); |
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|
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if (Progname != NULL) |
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free(Progname); |
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|
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Progname = s; |
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|
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return "%%%s, "; |
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#else |
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#ifdef MSDOS |
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const char *name; |
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|
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if ((name = strrchr(progname, '\\')) == NULL) |
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name = progname; |
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|
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else |
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++name; |
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|
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if (Progname != NULL) |
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free(Progname); |
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|
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Progname = strsave(name); |
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|
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return "%s: "; |
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#else |
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/* Everything is assumed to be some variant of Unix. |
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*/ |
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const char *name; |
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|
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if ((name = strrchr(progname, '/')) == NULL) |
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name = progname; |
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|
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else |
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++name; |
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|
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if (Progname != NULL) |
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free(Progname); |
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|
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Progname = strsave(name); |
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|
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return "%s: "; |
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#endif /* !MSDOS */ |
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#endif /* !VMS */ |
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} |
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|
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|
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/* errf_set_progname() |
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* Convenience routine to set the errf prefix to include the progname. |
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*/ |
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void |
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errf_set_progname(name) |
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const char *name; |
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{ |
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const char *fmt; |
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|
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fmt = munge_progname(name); |
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errf_set_prefix(strf(fmt, Progname)); |
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} |
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|
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|
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/* errf_get_progname() |
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*/ |
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const char * |
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errf_get_progname() |
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{ |
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return Progname; |
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} |
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|
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|
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#ifdef __STDC__ |
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void |
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errf(const char *fmt, ...) |
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{ |
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|
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#else /* !__STDC__ */ |
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void |
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errf(va_alist) |
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va_dcl |
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{ |
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char *fmt; |
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#endif /* !__STDC__ */ |
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va_list args; |
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char buffer[100]; |
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char *s; |
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|
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#ifdef __STDC__ |
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va_start(args, fmt); |
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#else |
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va_start(args); |
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fmt = va_arg(args, char *); |
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#endif |
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|
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s = formf(buffer, sizeof(buffer), fmt, args); |
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|
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va_end(args); |
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|
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(*User_errf_ofunc)(s); |
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|
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if (s != buffer) /* must have been obtained from malloc */ |
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free(s); |
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} |
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|
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|
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/* errf_usage() |
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* Output a usage string prefixed by the program name and exit(1). |
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*/ |
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void |
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errf_usage(usage) |
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const char *usage; |
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{ |
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if (User_errf_ofunc != default_ofunc) |
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(*User_errf_ofunc)(strf("Usage: %s %s", Progname, usage)); |
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else |
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fprintf(stderr, "Usage: %s %s\n", Progname, usage); |
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exit(1); |
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} |
