Annotation of src/usr.bin/dc/inout.c, Revision 1.2
1.2 ! deraadt 1: /* $OpenBSD: inout.c,v 1.1 2003/09/19 17:58:25 otto Exp $ */
1.1 otto 2:
3: /*
4: * Copyright (c) 2003, Otto Moerbeek <otto@drijf.net>
5: *
6: * Permission to use, copy, modify, and distribute this software for any
7: * purpose with or without fee is hereby granted, provided that the above
8: * copyright notice and this permission notice appear in all copies.
9: *
10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17: */
18:
19: #ifndef lint
1.2 ! deraadt 20: static const char rcsid[] = "$OpenBSD: inout.c,v 1.1 2003/09/19 17:58:25 otto Exp $";
1.1 otto 21: #endif /* not lint */
22:
23: #include <ssl/ssl.h>
24: #include <ctype.h>
25: #include <err.h>
26: #include <string.h>
27:
28: #include "extern.h"
29:
30: #define MAX_CHARS_PER_LINE 68
31:
32: static int charCount;
33:
34:
35: static int src_getcharstream(struct source *);
36: static int src_ungetcharstream(struct source *);
37: static char *src_getlinestream(struct source *);
38: static void src_freestream(struct source *);
39: static int src_getcharstring(struct source *);
40: static int src_ungetcharstring(struct source *);
41: static char *src_getlinestring(struct source *);
42: static void src_freestring(struct source *);
43: static void putcharwrap(FILE *, int);
44: static void printwrap(FILE *, const char *);
45: static char *get_digit(u_long, int, u_int);
46:
47: static struct vtable stream_vtable = {
48: src_getcharstream,
49: src_ungetcharstream,
50: src_getlinestream,
51: src_freestream
52: };
53:
54: static struct vtable string_vtable = {
55: src_getcharstring,
56: src_ungetcharstring,
57: src_getlinestring,
58: src_freestring
59: };
60:
61: void
62: src_setstream(struct source *src, FILE *stream)
63: {
64: src->u.stream = stream;
65: src->vtable = &stream_vtable;
66: }
67:
68: void
69: src_setstring(struct source *src, char *p)
70: {
71: src->u.string.buf = (u_char *)p;
72: src->u.string.pos = 0;
73: src->vtable = &string_vtable;
74: }
75:
76: static int
77: src_getcharstream(struct source *src)
78: {
79: return src->lastchar = getc(src->u.stream);
80: }
81:
82: static int
83: src_ungetcharstream(struct source *src)
84: {
85: return ungetc(src->lastchar, src->u.stream);
86: }
87:
88: static void
89: src_freestream(struct source *src)
90: {
91: }
92:
93: static char *
94: src_getlinestream(struct source *src)
95: {
96: char buf[BUFSIZ];
97:
98: if (fgets(buf, BUFSIZ, src->u.stream) == NULL)
99: return bstrdup("");
100: return bstrdup(buf);
101: }
102:
103: static int
104: src_getcharstring(struct source *src)
105: {
106: src->lastchar = src->u.string.buf[src->u.string.pos];
107: if (src->lastchar == '\0')
108: return EOF;
109: else {
110: src->u.string.pos++;
111: return src->lastchar;
112: }
113: }
114:
115: static int
116: src_ungetcharstring(struct source *src)
117: {
118: if (src->u.string.pos > 0)
119: return src->u.string.buf[--src->u.string.pos];
120: else
121: return EOF;
122: }
123:
124: static char *
125: src_getlinestring(struct source *src)
126: {
127: char buf[BUFSIZ];
128: int ch, i;
129:
130: i = 0;
131: while (i < BUFSIZ-1) {
132: ch = src_getcharstring(src);
133: if (ch == EOF)
134: break;
135: buf[i++] = ch;
136: if (ch == '\n')
137: break;
138: }
139: buf[i] = '\0';
140: return bstrdup(buf);
141: }
142:
143: static void
144: src_freestring(struct source *src)
145: {
146: free(src->u.string.buf);
147: }
148:
149: static void
150: putcharwrap(FILE *f, int ch)
151: {
152: putc(ch, f);
153: if (++charCount > MAX_CHARS_PER_LINE) {
154: charCount = 0;
155: fputs("\\\n", f);
156: }
157: }
158:
159: static void
160: printwrap(FILE *f, const char *p)
161: {
162: char buf[12];
163: char *q = buf;
164:
165: snprintf(buf, sizeof(buf), "%s", p);
166: while (*q)
167: putcharwrap(f, *q++);
168: }
169:
170: struct number *
171: readnumber(struct source *src, u_int base)
172: {
173: struct number *n;
174: int ch;
175: bool sign = false;
176: bool dot = false;
177: BN_ULONG v;
178:
179: n = new_number();
180: bn_check(BN_zero(n->number));
181:
182: while ((ch = (*src->vtable->readchar)(src)) != EOF) {
183:
184: if ('0' <= ch && ch <= '9')
185: v = ch - '0';
186: else if ('A' <= ch && ch <= 'F')
187: v = ch - 'A' + 10;
188: else if (ch == '_') {
189: sign = true;
190: continue;
191: } else if (ch == '.') {
192: if (dot)
193: break;
194: dot = true;
195: continue;
196: } else {
197: (*src->vtable->unreadchar)(src);
198: break;
199: }
200: if (dot)
201: n->scale++;
202:
203: bn_check(BN_mul_word(n->number, base));
204:
205: /* work around a bug in BN_add_word: 0 += 0 is buggy.... */
206: if (v > 0)
207: bn_check(BN_add_word(n->number, v));
208: }
209: if (sign)
210: negate(n);
211: return n;
212: }
213:
214: char *
215: read_string(struct source *src)
216: {
217: int count, i, sz, ch;
218: char *p;
219:
220: count = 1;
221: i = 0;
222: sz = 15;
223: p = bmalloc(sz + 1);
224:
225: while ((ch = (*src->vtable->readchar)(src)) != EOF) {
226: if (ch == '[')
227: count++;
228: else if (ch == ']')
229: count--;
230: if (count == 0)
231: break;
232: if (i == sz) {
233: sz *= 2;
234: p = brealloc(p, sz + 1);
235: }
236: p[i++] = ch;
237: }
238: p[i] = '\0';
239: return p;
240: }
241:
242: static char *
243: get_digit(u_long num, int digits, u_int base)
244: {
245: char *p;
246: if (base <= 16) {
247: p = bmalloc(2);
1.2 ! deraadt 248: p[0] = num >= 10 ? num + 'A' - 10 : num + '0';
1.1 otto 249: p[1] = '\0';
250: } else {
251: if (asprintf(&p, "%0*lu", digits, num) == -1)
252: err(1, "cannot allocate string");
253: }
254: return p;
255: }
256:
257: void
258: printnumber(FILE *f, const struct number *b, u_int base)
259: {
260: struct number *int_part, *fract_part;
261: int digits;
262: char buf[11];
263: size_t sz;
264: int i;
265: struct stack stack;
266: char *p;
267:
268: if (BN_is_zero(b->number))
269: putcharwrap(f, '0');
270:
271: int_part = new_number();
272: fract_part = new_number();
273: fract_part->scale = b->scale;
274:
275: if (base <= 16)
276: digits = 1;
277: else {
278: digits = snprintf(buf, sizeof(buf), "%u", base-1);
279: }
280: split_number(b, int_part->number, fract_part->number);
281:
282: i = 0;
283: stack_init(&stack);
284: while (!BN_is_zero(int_part->number)) {
285: BN_ULONG rem = BN_div_word(int_part->number, base);
286: stack_pushstring(&stack, get_digit(rem, digits, base));
287: i++;
288: }
289: sz = i;
290: charCount = 0;
291: if (BN_cmp(b->number, &zero) < 0)
292: putcharwrap(f, '-');
293: for (i = 0; i < sz; i++) {
294: p = stack_popstring(&stack);
295: if (base > 16)
296: putcharwrap(f, ' ');
297: printwrap(f, p);
298: free(p);
299: }
300: stack_clear(&stack);
301: if (b->scale > 0) {
302: struct number *num_base;
303: BIGNUM mult, stop;
304:
305: putcharwrap(f, '.');
306: num_base = new_number();
307: BN_set_word(num_base->number, base);
308: BN_init(&mult);
309: BN_one(&mult);
310: BN_init(&stop);
311: BN_one(&stop);
312: scale_number(&stop, b->scale);
313:
314: i = 0;
315: while (BN_cmp(&mult, &stop) < 0) {
316: u_long rem;
317:
318: if (i && base > 16)
319: putcharwrap(f, ' ');
320: i = 1;
321:
322: bmul_number(fract_part, fract_part, num_base);
323: split_number(fract_part, int_part->number, NULL);
324: rem = BN_get_word(int_part->number);
325: p = get_digit(rem, digits, base);
326: int_part->scale = 0;
327: normalize(int_part, fract_part->scale);
328: BN_sub(fract_part->number, fract_part->number,
329: int_part->number);
330: printwrap(f, p);
331: free(p);
332: BN_mul_word(&mult, base);
333: }
334: free_number(num_base);
335: BN_free(&mult);
336: BN_free(&stop);
337: }
338: free_number(int_part);
339: free_number(fract_part);
340: }
341:
342: void
343: print_value(FILE *f, const struct value *value, const char *prefix, u_int base)
344: {
345: fputs(prefix, f);
346: switch (value->type) {
347: case BCODE_NONE:
348: if (value->array != NULL)
349: fputs("<array>", f);
350: break;
351: case BCODE_NUMBER:
352: printnumber(f, value->u.num, base);
353: break;
354: case BCODE_STRING:
355: fputs(value->u.string, f);
356: break;
357: }
358: }
359:
360: void
361: print_ascii(FILE *f, const struct number *n)
362: {
363: BIGNUM *v;
364: int numbits, i, ch;
365:
366: v = BN_dup(n->number);
367: bn_checkp(v);
368:
369: if (BN_cmp(v, &zero) < 0)
370: bn_check(BN_sub(v, &zero, v));
371:
372: numbits = BN_num_bytes(v) * 8;
373: while (numbits > 0) {
374: ch = 0;
375: for (i = 0; i < 8; i++)
376: ch |= BN_is_bit_set(v, numbits-i-1) << (7 - i);
377: putc(ch, f);
378: numbits -= 8;
379: }
380: BN_free(v);
381: }