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252b5132 | 1 | /* sb.c - string buffer manipulation routines |
f0e652b4 | 2 | Copyright (C) 1994, 1995, 2000 Free Software Foundation, Inc. |
252b5132 RH |
3 | |
4 | Written by Steve and Judy Chamberlain of Cygnus Support, | |
5 | sac@cygnus.com | |
6 | ||
7 | This file is part of GAS, the GNU Assembler. | |
8 | ||
9 | GAS is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2, or (at your option) | |
12 | any later version. | |
13 | ||
14 | GAS is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with GAS; see the file COPYING. If not, write to the Free | |
21 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
f0e652b4 | 22 | 02111-1307, USA. */ |
252b5132 RH |
23 | |
24 | #include "config.h" | |
25 | #include <stdio.h> | |
f980ada0 L |
26 | #ifdef HAVE_STDLIB_H |
27 | #include <stdlib.h> | |
28 | #endif | |
252b5132 RH |
29 | #ifdef HAVE_STRING_H |
30 | #include <string.h> | |
31 | #else | |
32 | #include <strings.h> | |
33 | #endif | |
34 | #include "libiberty.h" | |
35 | #include "sb.h" | |
36 | ||
37 | /* These routines are about manipulating strings. | |
38 | ||
39 | They are managed in things called `sb's which is an abbreviation | |
40 | for string buffers. An sb has to be created, things can be glued | |
41 | on to it, and at the end of it's life it should be freed. The | |
42 | contents should never be pointed at whilst it is still growing, | |
43 | since it could be moved at any time | |
44 | ||
45 | eg: | |
46 | sb_new (&foo); | |
47 | sb_grow... (&foo,...); | |
48 | use foo->ptr[*]; | |
49 | sb_kill (&foo); | |
50 | ||
51 | */ | |
52 | ||
53 | #define dsize 5 | |
54 | ||
55 | static void sb_check PARAMS ((sb *, int)); | |
56 | ||
57 | /* Statistics of sb structures. */ | |
58 | ||
59 | int string_count[sb_max_power_two]; | |
60 | ||
61 | /* Free list of sb structures. */ | |
62 | ||
63 | static sb_list_vector free_list; | |
64 | ||
f0e652b4 | 65 | /* initializes an sb. */ |
252b5132 RH |
66 | |
67 | void | |
68 | sb_build (ptr, size) | |
69 | sb *ptr; | |
70 | int size; | |
71 | { | |
72 | /* see if we can find one to allocate */ | |
73 | sb_element *e; | |
74 | ||
75 | if (size > sb_max_power_two) | |
76 | abort (); | |
77 | ||
78 | e = free_list.size[size]; | |
79 | if (!e) | |
80 | { | |
81 | /* nothing there, allocate one and stick into the free list */ | |
82 | e = (sb_element *) xmalloc (sizeof (sb_element) + (1 << size)); | |
83 | e->next = free_list.size[size]; | |
84 | e->size = 1 << size; | |
85 | free_list.size[size] = e; | |
86 | string_count[size]++; | |
87 | } | |
88 | ||
89 | /* remove from free list */ | |
90 | ||
91 | free_list.size[size] = e->next; | |
92 | ||
93 | /* copy into callers world */ | |
94 | ptr->ptr = e->data; | |
95 | ptr->pot = size; | |
96 | ptr->len = 0; | |
97 | ptr->item = e; | |
98 | } | |
99 | ||
252b5132 RH |
100 | void |
101 | sb_new (ptr) | |
102 | sb *ptr; | |
103 | { | |
104 | sb_build (ptr, dsize); | |
105 | } | |
106 | ||
107 | /* deallocate the sb at ptr */ | |
108 | ||
109 | void | |
110 | sb_kill (ptr) | |
111 | sb *ptr; | |
112 | { | |
113 | /* return item to free list */ | |
114 | ptr->item->next = free_list.size[ptr->pot]; | |
115 | free_list.size[ptr->pot] = ptr->item; | |
116 | } | |
117 | ||
118 | /* add the sb at s to the end of the sb at ptr */ | |
119 | ||
120 | void | |
121 | sb_add_sb (ptr, s) | |
122 | sb *ptr; | |
123 | sb *s; | |
124 | { | |
125 | sb_check (ptr, s->len); | |
126 | memcpy (ptr->ptr + ptr->len, s->ptr, s->len); | |
127 | ptr->len += s->len; | |
128 | } | |
129 | ||
130 | /* make sure that the sb at ptr has room for another len characters, | |
f0e652b4 | 131 | and grow it if it doesn't. */ |
252b5132 RH |
132 | |
133 | static void | |
134 | sb_check (ptr, len) | |
135 | sb *ptr; | |
136 | int len; | |
137 | { | |
138 | if (ptr->len + len >= 1 << ptr->pot) | |
139 | { | |
140 | sb tmp; | |
141 | int pot = ptr->pot; | |
142 | while (ptr->len + len >= 1 << pot) | |
143 | pot++; | |
144 | sb_build (&tmp, pot); | |
145 | sb_add_sb (&tmp, ptr); | |
146 | sb_kill (ptr); | |
147 | *ptr = tmp; | |
148 | } | |
149 | } | |
150 | ||
151 | /* make the sb at ptr point back to the beginning. */ | |
152 | ||
153 | void | |
154 | sb_reset (ptr) | |
155 | sb *ptr; | |
156 | { | |
157 | ptr->len = 0; | |
158 | } | |
159 | ||
f0e652b4 | 160 | /* add character c to the end of the sb at ptr. */ |
252b5132 RH |
161 | |
162 | void | |
163 | sb_add_char (ptr, c) | |
164 | sb *ptr; | |
165 | int c; | |
166 | { | |
167 | sb_check (ptr, 1); | |
168 | ptr->ptr[ptr->len++] = c; | |
169 | } | |
170 | ||
f0e652b4 | 171 | /* add null terminated string s to the end of sb at ptr. */ |
252b5132 RH |
172 | |
173 | void | |
174 | sb_add_string (ptr, s) | |
175 | sb *ptr; | |
176 | const char *s; | |
177 | { | |
178 | int len = strlen (s); | |
179 | sb_check (ptr, len); | |
180 | memcpy (ptr->ptr + ptr->len, s, len); | |
181 | ptr->len += len; | |
182 | } | |
183 | ||
184 | /* add string at s of length len to sb at ptr */ | |
185 | ||
186 | void | |
187 | sb_add_buffer (ptr, s, len) | |
188 | sb *ptr; | |
189 | const char *s; | |
190 | int len; | |
191 | { | |
192 | sb_check (ptr, len); | |
193 | memcpy (ptr->ptr + ptr->len, s, len); | |
194 | ptr->len += len; | |
195 | } | |
196 | ||
197 | /* print the sb at ptr to the output file */ | |
198 | ||
199 | void | |
200 | sb_print (outfile, ptr) | |
201 | FILE *outfile; | |
202 | sb *ptr; | |
203 | { | |
204 | int i; | |
205 | int nc = 0; | |
206 | ||
207 | for (i = 0; i < ptr->len; i++) | |
208 | { | |
209 | if (nc) | |
210 | { | |
211 | fprintf (outfile, ","); | |
212 | } | |
213 | fprintf (outfile, "%d", ptr->ptr[i]); | |
214 | nc = 1; | |
215 | } | |
216 | } | |
217 | ||
f0e652b4 | 218 | void |
252b5132 RH |
219 | sb_print_at (outfile, idx, ptr) |
220 | FILE *outfile; | |
221 | int idx; | |
222 | sb *ptr; | |
223 | { | |
224 | int i; | |
225 | for (i = idx; i < ptr->len; i++) | |
226 | putc (ptr->ptr[i], outfile); | |
227 | } | |
228 | ||
229 | /* put a null at the end of the sb at in and return the start of the | |
f0e652b4 | 230 | string, so that it can be used as an arg to printf %s. */ |
252b5132 RH |
231 | |
232 | char * | |
233 | sb_name (in) | |
234 | sb *in; | |
235 | { | |
236 | /* stick a null on the end of the string */ | |
237 | sb_add_char (in, 0); | |
238 | return in->ptr; | |
239 | } | |
240 | ||
241 | /* like sb_name, but don't include the null byte in the string. */ | |
242 | ||
243 | char * | |
244 | sb_terminate (in) | |
245 | sb *in; | |
246 | { | |
247 | sb_add_char (in, 0); | |
248 | --in->len; | |
249 | return in->ptr; | |
250 | } | |
251 | ||
252 | /* start at the index idx into the string in sb at ptr and skip | |
253 | whitespace. return the index of the first non whitespace character */ | |
254 | ||
255 | int | |
256 | sb_skip_white (idx, ptr) | |
257 | int idx; | |
258 | sb *ptr; | |
259 | { | |
260 | while (idx < ptr->len | |
261 | && (ptr->ptr[idx] == ' ' | |
262 | || ptr->ptr[idx] == '\t')) | |
263 | idx++; | |
264 | return idx; | |
265 | } | |
266 | ||
267 | /* start at the index idx into the sb at ptr. skips whitespace, | |
268 | a comma and any following whitespace. returnes the index of the | |
f0e652b4 | 269 | next character. */ |
252b5132 RH |
270 | |
271 | int | |
272 | sb_skip_comma (idx, ptr) | |
273 | int idx; | |
274 | sb *ptr; | |
275 | { | |
276 | while (idx < ptr->len | |
277 | && (ptr->ptr[idx] == ' ' | |
278 | || ptr->ptr[idx] == '\t')) | |
279 | idx++; | |
280 | ||
281 | if (idx < ptr->len | |
282 | && ptr->ptr[idx] == ',') | |
283 | idx++; | |
284 | ||
285 | while (idx < ptr->len | |
286 | && (ptr->ptr[idx] == ' ' | |
287 | || ptr->ptr[idx] == '\t')) | |
288 | idx++; | |
289 | ||
290 | return idx; | |
291 | } |