1 /* flex - tool to generate fast lexical analyzers */
3 /* Copyright (c) 1990 The Regents of the University of California. */
4 /* All rights reserved. */
6 /* This code is derived from software contributed to Berkeley by */
9 /* The United States Government has rights in this work pursuant */
10 /* to contract no. DE-AC03-76SF00098 between the United States */
11 /* Department of Energy and the University of California. */
13 /* This file is part of flex. */
15 /* Redistribution and use in source and binary forms, with or without */
16 /* modification, are permitted provided that the following conditions */
19 /* 1. Redistributions of source code must retain the above copyright */
20 /* notice, this list of conditions and the following disclaimer. */
21 /* 2. Redistributions in binary form must reproduce the above copyright */
22 /* notice, this list of conditions and the following disclaimer in the */
23 /* documentation and/or other materials provided with the distribution. */
25 /* Neither the name of the University nor the names of its contributors */
26 /* may be used to endorse or promote products derived from this software */
27 /* without specific prior written permission. */
29 /* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
30 /* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
31 /* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
36 /* Take note: The buffer object is sometimes used as a String buffer (one
37 * continuous string), and sometimes used as a list of strings, usually line by
40 * The type is specified in buf_init by the elt_size. If the elt_size is
41 * sizeof(char), then the buffer should be treated as string buffer. If the
42 * elt_size is sizeof(char*), then the buffer should be treated as a list of
45 * Certain functions are only appropriate for one type or the other.
49 struct Buf userdef_buf; /**< for user #definitions triggered by cmd-line. */
50 struct Buf defs_buf; /**< for #define's autogenerated. List of strings. */
51 struct Buf yydmap_buf; /**< string buffer to hold yydmap elements */
52 struct Buf m4defs_buf; /**< m4 definitions. List of strings. */
53 struct Buf top_buf; /**< contains %top code. String buffer. */
55 struct Buf *buf_print_strings(struct Buf * buf, FILE* out)
62 for (i=0; i < buf->nelts; i++){
63 const char * s = ((char**)buf->elts)[i];
65 fprintf(out, "%s", s);
70 /* Append a "%s" formatted string to a string buffer */
71 struct Buf *buf_prints (struct Buf *buf, const char *fmt, const char *s)
76 t = flex_alloc (tsz = strlen (fmt) + strlen (s) + 1);
78 flexfatal (_("Allocation of buffer to print string failed"));
79 snprintf (t, tsz, fmt, s);
80 buf = buf_strappend (buf, t);
85 /** Append a line directive to the string buffer.
86 * @param buf A string buffer.
87 * @param filename file name
88 * @param lineno line number
91 struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno)
95 t = flex_alloc (strlen ("#line \"\"\n") + /* constant parts */
96 2 * strlen (filename) + /* filename with possibly all backslashes escaped */
97 (int) (1 + log10 (abs (lineno))) + /* line number */
100 flexfatal (_("Allocation of buffer for line directive failed"));
101 for (dst = t + sprintf (t, "#line %d \"", lineno), src = filename; *src; *dst++ = *src++)
102 if (*src == '\\') /* escape backslashes */
107 buf = buf_strappend (buf, t);
113 /** Append the contents of @a src to @a dest.
114 * @param @a dest the destination buffer
115 * @param @a dest the source buffer
118 struct Buf *buf_concat(struct Buf* dest, const struct Buf* src)
120 buf_append(dest, src->elts, src->nelts);
125 /* Appends n characters in str to buf. */
126 struct Buf *buf_strnappend (buf, str, n)
131 buf_append (buf, str, n + 1);
133 /* "undo" the '\0' character that buf_append() already copied. */
139 /* Appends characters in str to buf. */
140 struct Buf *buf_strappend (buf, str)
144 return buf_strnappend (buf, str, strlen (str));
147 /* appends "#define str def\n" */
148 struct Buf *buf_strdefine (buf, str, def)
153 buf_strappend (buf, "#define ");
154 buf_strappend (buf, " ");
155 buf_strappend (buf, str);
156 buf_strappend (buf, " ");
157 buf_strappend (buf, def);
158 buf_strappend (buf, "\n");
162 /** Pushes "m4_define( [[def]], [[val]])m4_dnl" to end of buffer.
163 * @param buf A buffer as a list of strings.
164 * @param def The m4 symbol to define.
165 * @param val The definition; may be NULL.
168 struct Buf *buf_m4_define (struct Buf *buf, const char* def, const char* val)
170 const char * fmt = "m4_define( [[%s]], [[%s]])m4_dnl\n";
175 str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + strlen(val) + 2);
177 flexfatal (_("Allocation of buffer for m4 def failed"));
179 snprintf(str, strsz, fmt, def, val);
180 buf_append(buf, &str, 1);
184 /** Pushes "m4_undefine([[def]])m4_dnl" to end of buffer.
185 * @param buf A buffer as a list of strings.
186 * @param def The m4 symbol to undefine.
189 struct Buf *buf_m4_undefine (struct Buf *buf, const char* def)
191 const char * fmt = "m4_undefine( [[%s]])m4_dnl\n";
195 str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + 2);
197 flexfatal (_("Allocation of buffer for m4 undef failed"));
199 snprintf(str, strsz, fmt, def);
200 buf_append(buf, &str, 1);
204 /* create buf with 0 elements, each of size elem_size. */
205 void buf_init (buf, elem_size)
209 buf->elts = (void *) 0;
211 buf->elt_size = elem_size;
216 void buf_destroy (buf)
219 if (buf && buf->elts)
220 flex_free (buf->elts);
221 buf->elts = (void *) 0;
225 /* appends ptr[] to buf, grow if necessary.
226 * n_elem is number of elements in ptr[], NOT bytes.
228 * We grow by mod(512) boundaries.
231 struct Buf *buf_append (buf, ptr, n_elem)
238 if (!ptr || n_elem == 0)
241 /* May need to alloc more. */
242 if (n_elem + buf->nelts > buf->nmax) {
244 /* exact amount needed... */
245 n_alloc = (n_elem + buf->nelts) * buf->elt_size;
247 /* ...plus some extra */
248 if (((n_alloc * buf->elt_size) % 512) != 0
249 && buf->elt_size < 512)
252 ((n_alloc * buf->elt_size) % 512)) /
257 allocate_array (n_alloc, buf->elt_size);
260 reallocate_array (buf->elts, n_alloc,
266 memcpy ((char *) buf->elts + buf->nelts * buf->elt_size, ptr,
267 n_elem * buf->elt_size);
268 buf->nelts += n_elem;
273 /* vim:set tabstop=8 softtabstop=4 shiftwidth=4: */