source: buchla-68k/orig/GP/GENMAIN.C

Last change on this file was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Imported original source code.
  • Property mode set to 100755
File size: 11.2 KB
Line 
1/*
2 ============================================================================
3 genmain.c -- general purpose main
4 Version 1 -- 1987-11-10 -- D.N. Lynx Crowe
5
6 Skeleton main program and option processing functions.
7 Designed to be copied and hacked up into a real program.
8 Handles all of the usual Unix(tm) style command line option forms.
9
10 The functions Done(), Process(), Usage() and findopt() will need to be
11 modified to make this into a real program. It may also be useful
12 to modify Die() for any error cleanup necessary.
13 ============================================================================
14*/
15
16#include "stdio.h"
17#include "ctype.h"
18#include "stddefs.h"
19
20/* Things that will change from program to program */
21
22#define PGMNAME "genmain" /* program name to use in messages */
23
24#define NULLFILE "stdin" /* null input file default */
25
26#define A_DFLTN -1 /* default value for a_argn */
27#define A_ALTN 1 /* alternate default for a_argn */
28#define C_DFLTC 'C' /* default character for c_argc */
29#define C_DFLTN -1 /* default value for c_argn */
30#define C_ALTN 1 /* alternate default for c_argn */
31#define H_DFLTS "h default" /* defalut value for h_args */
32#define L_DFLTN -1 /* default value for l_argn */
33#define S_ALTC 's' /* alternate default for s_argc */
34#define S_DFLTC 'S' /* default character for s_argc */
35
36#define NUM_DFLT -1 /* default value for num_arg */
37
38int a_argn = A_DFLTN; /* switch a numeric argument */
39int c_argn = C_DFLTN; /* switch c numeric argument */
40int l_argn = L_DFLTN; /* switch l numeric argument */
41int num_arg = NUM_DFLT; /* general numeric argument */
42
43int x_argf = FALSE; /* switch x value */
44
45char *h_args = H_DFLTS; /* switch h string argument */
46
47char c_argc = C_DFLTC; /* switch c character argument */
48char s_argc = S_DFLTC; /* switch s character argument */
49
50/*
51
52*/
53
54/* Standard stuff, unlikely to change much, if at all */
55
56int nfdone = 0; /* number of file arguments processed */
57int exitarg = 0; /* exit() argument */
58int nerrors = 0; /* number of errors encountered */
59
60#define L_PLURAL(N) ((N) ? ((N) GT 1 ? "s" : "") : "")
61#define U_PLURAL(N) ((N) ? ((N) GT 1 ? "S" : "") : "")
62
63#define EN_MSGL(X) ((X) ? "enabled" : "disabled")
64#define EN_MSGM(X) ((X) ? "Enabled" : "Disabled")
65#define EN_MSGU(X) ((X) ? "ENABLED" : "DISABLED")
66
67#define TF_MSGL(X) ((X) ? "true" : "false")
68#define TF_MSGM(X) ((X) ? "True" : "False")
69#define TF_MSGU(X) ((X) ? "TRUE" : "FALSE")
70
71#define SW_MSGL(X) ((X) ? "on" : "off")
72#define SW_MSGM(X) ((X) ? "On" : "Off")
73#define SW_MSGU(X) ((X) ? "ON" : "OFF")
74
75#define GETCARG(N,C,D) if ((N = intopt(argv, &C)) < 0) N = D
76#define GETARG(N,D) if ((N = atoix(argv)) < 0) N = D
77
78#define PGM_ERR(S) fprintf(stderr, "%s: ERROR - %s", PGMNAME, S)
79#define PGM_WARN(S) fprintf(stderr, "%s: WARNING - %s", PGMNAME, S)
80#define PGM_MSG(S) fprintf(stderr, "%s: %s", PGMNAME, S)
81
82#define NOFILE ""
83
84/*
85
86*/
87
88/*
89 =============================================================================
90 Die() -- print an error message and exit
91 =============================================================================
92*/
93
94Die(s)
95char *s; /* message string */
96{
97 ++nerrors;
98 PGM_ERR(s);
99 fprintf(stderr, "\n%s: Terminated with %d error%s.\n",
100 PGMNAME, nerrors, L_PLURAL(nerrors));
101
102 exit(1);
103}
104
105/*
106 =============================================================================
107 n_errs() -- create a "One|No|n errors was|were" message string
108
109 If n is:
110
111 LE 0 "No errors were"
112 EQ 1 "One error was"
113 GT 1 "n errors were" (n is the number of errors)
114 =============================================================================
115*/
116
117char *
118n_errs(n)
119int n; /* number of errors */
120{
121 static char buf[100];
122
123 if (n GT 1) {
124
125 sprintf(buf, "%d errors were", n);
126 return(buf);
127
128 } else if (n EQ 1)
129 return("One error was");
130 else
131 return("No errors were");
132}
133
134/*
135
136*/
137
138/*
139 =============================================================================
140 ffiler() -- create a "Can't open" message string for Die()
141 =============================================================================
142*/
143
144char *
145ffiler(s)
146char *s; /* file name string pointer */
147{
148 static char buf[100];
149
150 sprintf(buf, "Can't open %s", s);
151 return (buf);
152}
153
154/*
155 =============================================================================
156 badopt() -- create an "Invalid option 'c'" message string for Die()
157 =============================================================================
158*/
159
160char *
161badopt(c)
162char c; /* character to complain about */
163{
164 static char buf[100];
165
166 sprintf(buf, "Invalid option \047%c\047", c);
167 return (buf);
168}
169
170/*
171
172*/
173
174/*
175 =============================================================================
176 Usage() -- print the usage message
177
178 This shows a way to do it, complete with current defaults.
179 =============================================================================
180*/
181
182Usage()
183{
184 fprintf(stderr, "\n%s usage:\n\n", PGMNAME);
185
186 fprintf(stderr, " %s -an -ccn -h string -ln -sc -x\n\n", PGMNAME);
187
188 fprintf(stderr, " -an argument a (%d)\n",
189 A_ALTN);
190 fprintf(stderr, " -ccn argument c (\047%c\047, %d)\n",
191 C_DFLTC, C_DFLTN);
192 fprintf(stderr, " -h string argument h (\042%s\042)\n",
193 h_args);
194 fprintf(stderr, " -ln argument l (%d)\n",
195 0);
196 fprintf(stderr, " -sc argument s (\047%c\047)\n",
197 S_DFLTC);
198 fprintf(stderr, " -x argument x \042%s\042\n",
199 TF_MSGM(x_argf));
200
201 fprintf(stderr, "\n");
202}
203
204/*
205
206*/
207
208/*
209 =============================================================================
210 Done() -- final processing
211
212 This is where any end-of-program processing would be done.
213 =============================================================================
214*/
215
216Done()
217{
218 printf("\n%s: Final values were -\n\n", PGMNAME);
219
220 printf(" a_argn = %d\n", a_argn);
221 printf(" c_argn = %d\n", c_argn);
222 printf(" c_argc = \047%c\047\n", c_argc);
223 printf(" h_args = \042%s\042\n", h_args);
224 printf(" l_argn = %d\n", l_argn);
225 printf(" num_arg = %d\n", num_arg);
226 printf(" s_argc = \047%c\047\n", s_argc);
227 printf(" x_argf = %s\n", TF_MSGM(x_argf));
228
229 if (nerrors) /* if any errors, exit with an error value */
230 exitarg = 1;
231
232 printf("\n%s: Processing complete. %s encountered\n",
233 PGMNAME, n_errs(nerrors));
234}
235
236/*
237
238*/
239
240/*
241 =============================================================================
242 Process() -- process a file name argument
243
244 This is where each file in the argument list would be processed.
245 =============================================================================
246*/
247
248Process(s)
249char *s; /* file name string pointer */
250{
251 if (*s) { /* process a file */
252
253 printf("%s processed\n", s);
254
255 } else { /* process a null file (usually means use stdin) */
256
257 printf("null file (%s) processed\n", NULLFILE);
258 }
259}
260
261/*
262
263*/
264
265/*
266 =============================================================================
267 atoix() -- get a numeric argument or return 0
268 =============================================================================
269*/
270
271atoix(p)
272register char **p; /* pointer to the string pointer */
273{
274 register int n, c;
275
276 n = 0;
277
278 while (isdigit(c = *++*p))
279 n = 10 * n + c - '0';
280
281 --*p;
282 return (n);
283}
284
285/*
286 =============================================================================
287 intopt() -- get an optional character and numeric argument
288
289 option form: -cn
290
291 where: c is the optional character
292 n is the (non-zero) numeric value
293 =============================================================================
294*/
295
296intopt(argv, optp)
297char *argv[]; /* argv pointer */
298char *optp; /* pointer to the character variable to be set */
299{
300 int c;
301
302 if ((c = (*argv)[1]) NE '\0' && !isdigit(c)) {
303 *optp = c;
304 ++*argv;
305 }
306
307 return ((c = atoix(argv)) NE 0 ? c : -1);
308}
309
310/*
311
312*/
313
314/*
315 =============================================================================
316 findopt() -- extract and process options up to the first file argument
317 =============================================================================
318*/
319
320int
321findopt(argc, argv)
322int argc; /* argument count */
323char *argv[]; /* argument pointer array pointer */
324{
325 char **eargv; /* pointer to argument pointer */
326 int eargc; /* remaining arguments after options */
327 int c; /* current character being processed */
328 int strsw; /* string argument grabbed switch */
329
330 eargv = argv; /* start with first argument */
331 eargc = 0; /* set file count to zero */
332 strsw = FALSE; /* indicate no string grabbed */
333
334 while (--argc > 0) {
335
336 switch (c = **++argv) {
337
338 case '-': /* options start with '-' ... */
339
340 case '+': /* ... or they can start with '+' */
341
342 if ((c = *++*argv) EQ '\0') /* just '-' is end */
343 break;
344/*
345
346*/
347 do {
348 if (isdigit(c)) { /* general numeric arg */
349
350 --*argv;
351 num_arg = atoix(argv);
352
353 } else
354
355 switch (c) { /* switch on option letter */
356
357 case 'a': /* -an */
358
359 GETARG(a_argn, A_ALTN);
360 continue;
361
362 case 'c': /* -ccn */
363
364 GETCARG(c_argn, c_argc, C_ALTN);
365 continue;
366
367 case 'h': /* -h string */
368
369 if (--argc > 0) {
370
371 strsw = TRUE;
372 h_args = argv[1];
373 }
374
375 continue;
376
377 case 'l': /* -ln */
378
379 l_argn = atoix(argv);
380 continue;
381
382 case 's': /* -sc */
383
384 if ((s_argc = (*argv)[1]) NE '\0')
385 ++*argv;
386 else
387 s_argc = S_ALTC;
388
389 continue;
390/*
391
392*/
393
394 case 'x': /* -x */
395
396 x_argf = NOT x_argf;
397 continue;
398
399 default : /* unrecognized option */
400
401 Usage();
402 Die(badopt(c));
403 }
404
405 } while ((c = *++*argv) NE '\0');
406
407 if (strsw) { /* if we've eaten an argument */
408
409 strsw = FALSE;
410 ++argv;
411 }
412
413 continue;
414 }
415
416 *eargv++ = *argv; /* update the argv list */
417 ++eargc; /* update the argument count */
418 }
419
420 return (eargc);
421}
422
423/*
424
425*/
426
427/*
428 =============================================================================
429 main() -- the main function for this program
430 =============================================================================
431*/
432
433main(argc, argv)
434int argc;
435char *argv[];
436{
437 nfdone = 0;
438
439 for (argc = findopt(argc, argv); argc > 0; --argc, ++argv) {
440
441 Process(*argv);
442 ++nfdone;
443 }
444
445 if (!nfdone) /* no files named, use NOFILE as argument */
446 Process(NOFILE);
447
448 Done(); /* final processing */
449
450 exit(exitarg);
451}
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