source: buchla-68k/libcio/scan.c@ e877e55

Last change on this file since e877e55 was b28a12e, checked in by Thomas Lopatic <thomas@…>, 8 years ago

Zero redundant declarations.
  • Property mode set to 100644
File size: 4.6 KB
Line 
1/*
2 =============================================================================
3 scan.c -- input scan conversion for the portable C I/O Library
4 Version 3 -- 1989-01-16 -- D.N. Lynx Crowe
5 =============================================================================
6*/
7
8#include "ram.h"
9
10static int16_t maxwide;
11static int16_t (*gsub)();
12
13static int8_t *scnstr;
14static int8_t quit;
15
16/*
17
18*/
19
20static int32_t getnum(int8_t *list, int8_t *values, int16_t base)
21{
22 register int32_t val;
23 register int8_t *cp;
24 int16_t c;
25 int16_t sign;
26
27 if (maxwide LE 0)
28 return(0L);
29
30 val = sign = 0;
31
32 if ((c = (*gsub)(0)) EQ '-') {
33
34 sign = 1;
35 --maxwide;
36
37 } else if (c EQ '+')
38 --maxwide;
39 else
40 (*gsub)(1);
41
42 while (maxwide--) {
43
44 if ((cp = index(list, (*gsub)(0))) EQ NULL) {
45
46 (*gsub)(1);
47 break;
48 }
49
50 val *= base;
51 val += values[(int32_t)cp - (int32_t)list];
52 }
53
54 if (sign)
55 val = -val;
56
57 return(val);
58}
59
60/*
61
62*/
63
64static int16_t skipblk(void)
65{
66 while (isspace((*gsub)(0)))
67 ;
68
69 if ((*gsub)(1) EQ EOF)
70 return(EOF);
71
72 return(0);
73}
74
75static int16_t sgetc(int16_t what)
76{
77 if (what EQ 0) {
78
79 if (*scnstr)
80 return(*scnstr++ & 0x00FF);
81
82 quit = TRUE;
83
84 } else {
85
86 if (!quit)
87 return(*--scnstr & 0x00FF);
88 }
89
90 return(EOF);
91}
92
93/*
94
95*/
96
97int16_t scanfmt(int16_t (*getsub)(), int8_t *fmt, int16_t **args)
98{
99
100#ifdef FLOAT
101 double getflt(), d;
102#endif
103
104 int32_t lv;
105 int16_t c, count, dontdo, lflag, base;
106 int8_t *cp;
107 int8_t tlist[130];
108
109 static int8_t list[] = "ABCDEFabcdef9876543210";
110
111 static int8_t vals[] = {
112
113 10,11,12,13,14,15,10,11,12,13,14,15,9,8,7,6,5,4,3,2,1,0
114 };
115
116/*
117
118*/
119 count = 0;
120 gsub = getsub;
121
122 while (c = *fmt++) {
123
124 if (c EQ '%') {
125
126 lflag = dontdo = FALSE;
127 maxwide = 127;
128
129 if (*fmt EQ '*') {
130 ++fmt;
131 dontdo = 1;
132 }
133
134 if (isdigit(*fmt)) {
135
136 maxwide = 0;
137
138 do {
139
140 maxwide = maxwide*10 + *fmt - '0';
141
142 } while (isdigit(*++fmt));
143 }
144
145 if (*fmt EQ 'l') {
146
147 lflag = TRUE;
148 ++fmt;
149 }
150
151/*
152
153*/
154 switch (*fmt++) {
155
156 case '%':
157 c = '%';
158 goto matchit;
159
160 case 'h': /* specify short (for compatibility) */
161 lflag = FALSE;
162 goto decimal;
163
164 case 'D':
165 lflag = TRUE;
166
167 case 'd':
168 decimal:
169 c = 12;
170 base = 10;
171 goto getval;
172
173 case 'X':
174 lflag = TRUE;
175
176 case 'x':
177 c = 0;
178 base = 16;
179 goto getval;
180
181 case 'O':
182 lflag = TRUE;
183
184 case 'o':
185 c = 14;
186 base = 8;
187 getval:
188 if (skipblk())
189 goto ateof;
190
191 lv = getnum(&list[c], &vals[c], base);
192
193 if (!dontdo) {
194
195 if (lflag)
196 *(int32_t *)(*args++) = lv;
197 else
198 **args++ = lv;
199 ++count;
200 }
201
202 break;
203/*
204
205*/
206
207#ifdef FLOAT
208 case 'E':
209 case 'F':
210 lflag = TRUE;
211
212 case 'e':
213 case 'f':
214 if (skipblk())
215 goto ateof;
216
217 d = getflt(tlist);
218
219 if (!dontdo) {
220
221 if (lflag)
222 *(double *)(*args++) = d;
223 else
224 *(float *)(*args++) = d;
225 ++count;
226 }
227
228 break;
229#endif
230
231/*
232
233*/
234
235 case '[':
236 lflag = FALSE;
237
238 if (*fmt EQ '^' || *fmt EQ '~') {
239
240 ++fmt;
241 lflag = TRUE;
242 }
243
244 for (cp = tlist ; (c = *fmt++) != ']' ; )
245 *cp++ = c;
246
247 *cp = 0;
248 goto string;
249
250 case 's':
251 lflag = TRUE;
252 tlist[0] = ' ';
253 tlist[1] = '\t';
254 tlist[2] = '\n';
255 tlist[3] = 0;
256 string:
257 if (skipblk())
258 goto ateof;
259
260 if (!dontdo)
261 cp = *args++;
262
263 while (maxwide--) {
264
265 if ((c = (*gsub)(0)) EQ EOF)
266 break;
267
268 if (lflag ?
269 (index(tlist, c) NE 0) :
270 (index(tlist, c) EQ 0)) {
271
272 (*gsub)(1); /* unget last character */
273 break;
274 }
275
276 if (!dontdo)
277 *cp++ = c;
278 }
279
280 if (!dontdo) {
281
282 *cp = 0;
283 ++count;
284 }
285
286 break;
287/*
288
289*/
290 case 'c':
291 if ((c = (*gsub)(0)) EQ EOF)
292 goto ateof;
293
294 if (!dontdo) {
295
296 *(int8_t *)(*args++) = c;
297 ++count;
298 }
299
300 break;
301 }
302
303 } else if (isspace(c)) {
304
305 if (skipblk()) {
306ateof:
307 if (count EQ 0)
308 return(EOF);
309
310 return(count);
311 }
312
313 } else {
314
315matchit:
316 if (skipblk())
317 goto ateof;
318
319 if ((*gsub)(0) != c)
320 return(count);
321 }
322 }
323
324 return(count);
325}
326
327/*
328
329*/
330
331#ifdef FLOAT
332
333double
334getflt(buffer)
335char *buffer;
336{
337 register int c;
338 char decpt, sign, exp;
339 register char *cp;
340 double atof();
341
342 cp = buffer;
343 sign = exp = decpt = 0;
344
345 while (maxwide--) {
346
347 c = (*gsub)(0);
348
349 if (!sign AND (c EQ '-' OR c EQ '+'))
350 sign = 1;
351 else if (!decpt AND c EQ '.')
352 decpt = 1;
353 else if (!exp AND (c EQ 'e' OR c EQ 'E')) {
354
355 sign = 0;
356 exp = decpt = 1;
357
358 } else if (!isdigit(c)) {
359
360 (*gsub)(1);
361 break;
362 }
363
364 *cp++ = c;
365 }
366
367 *cp = 0;
368 return(atof(buffer));
369}
370
371#endif
372
373/*
374
375*/
376
377int16_t sscanf(int8_t *string, int8_t *fmt, int16_t *args)
378{
379 scnstr = string;
380 quit = FALSE;
381 return(scanfmt(sgetc, fmt, &args));
382}
383
384
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