1 /* $NetBSD: buf.c,v 1.4 2014/10/30 18:44:05 christos Exp $ */
2
3 /* flex - tool to generate fast lexical analyzers */
4
5 /* Copyright (c) 1990 The Regents of the University of California. */
6 /* All rights reserved. */
7
8 /* This code is derived from software contributed to Berkeley by */
9 /* Vern Paxson. */
10
11 /* The United States Government has rights in this work pursuant */
12 /* to contract no. DE-AC03-76SF00098 between the United States */
13 /* Department of Energy and the University of California. */
14
15 /* This file is part of flex. */
16
17 /* Redistribution and use in source and binary forms, with or without */
18 /* modification, are permitted provided that the following conditions */
19 /* are met: */
20
21 /* 1. Redistributions of source code must retain the above copyright */
22 /* notice, this list of conditions and the following disclaimer. */
23 /* 2. Redistributions in binary form must reproduce the above copyright */
24 /* notice, this list of conditions and the following disclaimer in the */
25 /* documentation and/or other materials provided with the distribution. */
26
27 /* Neither the name of the University nor the names of its contributors */
28 /* may be used to endorse or promote products derived from this software */
29 /* without specific prior written permission. */
30
31 /* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
32 /* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
33 /* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
34 /* PURPOSE. */
35 #include "flexdef.h"
36 __RCSID("$NetBSD: buf.c,v 1.4 2014/10/30 18:44:05 christos Exp $");
37
38
39 /* Take note: The buffer object is sometimes used as a String buffer (one
40 * continuous string), and sometimes used as a list of strings, usually line by
41 * line.
42 *
43 * The type is specified in buf_init by the elt_size. If the elt_size is
44 * sizeof(char), then the buffer should be treated as string buffer. If the
45 * elt_size is sizeof(char*), then the buffer should be treated as a list of
46 * strings.
47 *
48 * Certain functions are only appropriate for one type or the other.
49 */
50
51 /* global buffers. */
52 struct Buf userdef_buf; /**< for user #definitions triggered by cmd-line. */
53 struct Buf defs_buf; /**< for #define's autogenerated. List of strings. */
54 struct Buf yydmap_buf; /**< string buffer to hold yydmap elements */
55 struct Buf m4defs_buf; /**< m4 definitions. List of strings. */
56 struct Buf top_buf; /**< contains %top code. String buffer. */
57
buf_print_strings(struct Buf * buf,FILE * out)58 struct Buf *buf_print_strings(struct Buf * buf, FILE* out)
59 {
60 int i;
61
62 if(!buf || !out)
63 return buf;
64
65 for (i=0; i < buf->nelts; i++){
66 const char * s = ((char**)buf->elts)[i];
67 if(s)
68 fprintf(out, "%s", s);
69 }
70 return buf;
71 }
72
73 /* Append a "%s" formatted string to a string buffer */
buf_prints(struct Buf * buf,const char * fmt,const char * s)74 struct Buf *buf_prints (struct Buf *buf, const char *fmt, const char *s)
75 {
76 char *t;
77 size_t tsz;
78
79 t = flex_alloc (tsz = strlen (fmt) + strlen (s) + 1);
80 if (!t)
81 flexfatal (_("Allocation of buffer to print string failed"));
82 snprintf (t, tsz, fmt, s);
83 buf = buf_strappend (buf, t);
84 flex_free (t);
85 return buf;
86 }
87
88 /** Append a line directive to the string buffer.
89 * @param buf A string buffer.
90 * @param filename file name
91 * @param lineno line number
92 * @return buf
93 */
buf_linedir(struct Buf * buf,const char * filename,int lineno)94 struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno)
95 {
96 char *dst, *t;
97 const char *src;
98
99 t = flex_alloc (strlen ("#line \"\"\n") + /* constant parts */
100 2 * strlen (filename) + /* filename with possibly all backslashes escaped */
101 (int) (1 + log10 (abs (lineno))) + /* line number */
102 1); /* NUL */
103 if (!t)
104 flexfatal (_("Allocation of buffer for line directive failed"));
105 for (dst = t + sprintf (t, "#line %d \"", lineno), src = filename; *src; *dst++ = *src++)
106 if (*src == '\\') /* escape backslashes */
107 *dst++ = '\\';
108 *dst++ = '"';
109 *dst++ = '\n';
110 *dst = '\0';
111 buf = buf_strappend (buf, t);
112 flex_free (t);
113 return buf;
114 }
115
116
117 /** Append the contents of @a src to @a dest.
118 * @param @a dest the destination buffer
119 * @param @a dest the source buffer
120 * @return @a dest
121 */
buf_concat(struct Buf * dest,const struct Buf * src)122 struct Buf *buf_concat(struct Buf* dest, const struct Buf* src)
123 {
124 buf_append(dest, src->elts, src->nelts);
125 return dest;
126 }
127
128
129 /* Appends n characters in str to buf. */
buf_strnappend(buf,str,n)130 struct Buf *buf_strnappend (buf, str, n)
131 struct Buf *buf;
132 const char *str;
133 int n;
134 {
135 buf_append (buf, str, n + 1);
136
137 /* "undo" the '\0' character that buf_append() already copied. */
138 buf->nelts--;
139
140 return buf;
141 }
142
143 /* Appends characters in str to buf. */
buf_strappend(buf,str)144 struct Buf *buf_strappend (buf, str)
145 struct Buf *buf;
146 const char *str;
147 {
148 return buf_strnappend (buf, str, strlen (str));
149 }
150
151 /* appends "#define str def\n" */
buf_strdefine(buf,str,def)152 struct Buf *buf_strdefine (buf, str, def)
153 struct Buf *buf;
154 const char *str;
155 const char *def;
156 {
157 buf_strappend (buf, "#define ");
158 buf_strappend (buf, " ");
159 buf_strappend (buf, str);
160 buf_strappend (buf, " ");
161 buf_strappend (buf, def);
162 buf_strappend (buf, "\n");
163 return buf;
164 }
165
166 /** Pushes "m4_define( [[def]], [[val]])m4_dnl" to end of buffer.
167 * @param buf A buffer as a list of strings.
168 * @param def The m4 symbol to define.
169 * @param val The definition; may be NULL.
170 * @return buf
171 */
buf_m4_define(struct Buf * buf,const char * def,const char * val)172 struct Buf *buf_m4_define (struct Buf *buf, const char* def, const char* val)
173 {
174 const char * fmt = "m4_define( [[%s]], [[%s]])m4_dnl\n";
175 char * str;
176 size_t strsz;
177
178 val = val?val:"";
179 str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + strlen(val) + 2);
180 if (!str)
181 flexfatal (_("Allocation of buffer for m4 def failed"));
182
183 snprintf(str, strsz, fmt, def, val);
184 buf_append(buf, &str, 1);
185 return buf;
186 }
187
188 /** Pushes "m4_undefine([[def]])m4_dnl" to end of buffer.
189 * @param buf A buffer as a list of strings.
190 * @param def The m4 symbol to undefine.
191 * @return buf
192 */
buf_m4_undefine(struct Buf * buf,const char * def)193 struct Buf *buf_m4_undefine (struct Buf *buf, const char* def)
194 {
195 const char * fmt = "m4_undefine( [[%s]])m4_dnl\n";
196 char * str;
197 size_t strsz;
198
199 str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + 2);
200 if (!str)
201 flexfatal (_("Allocation of buffer for m4 undef failed"));
202
203 snprintf(str, strsz, fmt, def);
204 buf_append(buf, &str, 1);
205 return buf;
206 }
207
208 /* create buf with 0 elements, each of size elem_size. */
buf_init(buf,elem_size)209 void buf_init (buf, elem_size)
210 struct Buf *buf;
211 size_t elem_size;
212 {
213 buf->elts = (void *) 0;
214 buf->nelts = 0;
215 buf->elt_size = elem_size;
216 buf->nmax = 0;
217 }
218
219 /* frees memory */
buf_destroy(buf)220 void buf_destroy (buf)
221 struct Buf *buf;
222 {
223 if (buf && buf->elts)
224 flex_free (buf->elts);
225 buf->elts = (void *) 0;
226 }
227
228
229 /* appends ptr[] to buf, grow if necessary.
230 * n_elem is number of elements in ptr[], NOT bytes.
231 * returns buf.
232 * We grow by mod(512) boundaries.
233 */
234
buf_append(buf,ptr,n_elem)235 struct Buf *buf_append (buf, ptr, n_elem)
236 struct Buf *buf;
237 const void *ptr;
238 int n_elem;
239 {
240 int n_alloc = 0;
241
242 if (!ptr || n_elem == 0)
243 return buf;
244
245 /* May need to alloc more. */
246 if (n_elem + buf->nelts > buf->nmax) {
247
248 /* exact amount needed... */
249 n_alloc = (n_elem + buf->nelts) * buf->elt_size;
250
251 /* ...plus some extra */
252 if (((n_alloc * buf->elt_size) % 512) != 0
253 && buf->elt_size < 512)
254 n_alloc +=
255 (512 -
256 ((n_alloc * buf->elt_size) % 512)) /
257 buf->elt_size;
258
259 if (!buf->elts)
260 buf->elts =
261 allocate_array (n_alloc, buf->elt_size);
262 else
263 buf->elts =
264 reallocate_array (buf->elts, n_alloc,
265 buf->elt_size);
266
267 buf->nmax = n_alloc;
268 }
269
270 memcpy ((char *) buf->elts + buf->nelts * buf->elt_size, ptr,
271 n_elem * buf->elt_size);
272 buf->nelts += n_elem;
273
274 return buf;
275 }
276
277 /* vim:set tabstop=8 softtabstop=4 shiftwidth=4: */
278