1 /* $NetBSD: buf.c,v 1.3 2017/01/02 17:45:27 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 1.3 2017/01/02 17:45:27 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 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 */ 74 struct Buf *buf_prints (struct Buf *buf, const char *fmt, const char *s) 75 { 76 char *t; 77 size_t tsz; 78 79 tsz = strlen(fmt) + strlen(s) + 1; 80 t = malloc(tsz); 81 if (!t) 82 flexfatal (_("Allocation of buffer to print string failed")); 83 snprintf (t, tsz, fmt, s); 84 buf = buf_strappend (buf, t); 85 free(t); 86 return buf; 87 } 88 89 /** Append a line directive to the string buffer. 90 * @param buf A string buffer. 91 * @param filename file name 92 * @param lineno line number 93 * @return buf 94 */ 95 struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno) 96 { 97 char *dst, *t; 98 const char *src; 99 size_t tsz; 100 101 if (gen_line_dirs) 102 return buf; 103 104 tsz = strlen("#line \"\"\n") + /* constant parts */ 105 2 * strlen (filename) + /* filename with possibly all backslashes escaped */ 106 (size_t) (1 + ceil (log10 (abs (lineno)))) + /* line number */ 107 1; /* NUL */ 108 t = malloc(tsz); 109 if (!t) 110 flexfatal (_("Allocation of buffer for line directive failed")); 111 for (dst = t + snprintf (t, tsz, "#line %d \"", lineno), src = filename; *src; *dst++ = *src++) 112 if (*src == '\\') /* escape backslashes */ 113 *dst++ = '\\'; 114 *dst++ = '"'; 115 *dst++ = '\n'; 116 *dst = '\0'; 117 buf = buf_strappend (buf, t); 118 free(t); 119 return buf; 120 } 121 122 123 /** Append the contents of @a src to @a dest. 124 * @param @a dest the destination buffer 125 * @param @a dest the source buffer 126 * @return @a dest 127 */ 128 struct Buf *buf_concat(struct Buf* dest, const struct Buf* src) 129 { 130 buf_append(dest, src->elts, src->nelts); 131 return dest; 132 } 133 134 135 /* Appends n characters in str to buf. */ 136 struct Buf *buf_strnappend (struct Buf *buf, const char *str, int n) 137 { 138 buf_append (buf, str, n + 1); 139 140 /* "undo" the '\0' character that buf_append() already copied. */ 141 buf->nelts--; 142 143 return buf; 144 } 145 146 /* Appends characters in str to buf. */ 147 struct Buf *buf_strappend (struct Buf *buf, const char *str) 148 { 149 return buf_strnappend (buf, str, (int) strlen (str)); 150 } 151 152 /* appends "#define str def\n" */ 153 struct Buf *buf_strdefine (struct Buf *buf, const char *str, const char *def) 154 { 155 buf_strappend (buf, "#define "); 156 buf_strappend (buf, " "); 157 buf_strappend (buf, str); 158 buf_strappend (buf, " "); 159 buf_strappend (buf, def); 160 buf_strappend (buf, "\n"); 161 return buf; 162 } 163 164 /** Pushes "m4_define( [[def]], [[val]])m4_dnl" to end of buffer. 165 * @param buf A buffer as a list of strings. 166 * @param def The m4 symbol to define. 167 * @param val The definition; may be NULL. 168 * @return buf 169 */ 170 struct Buf *buf_m4_define (struct Buf *buf, const char* def, const char* val) 171 { 172 const char * fmt = "m4_define( [[%s]], [[[[%s]]]])m4_dnl\n"; 173 char * str; 174 size_t strsz; 175 176 val = val?val:""; 177 strsz = strlen(fmt) + strlen(def) + strlen(val) + 2; 178 str = malloc(strsz); 179 if (!str) 180 flexfatal (_("Allocation of buffer for m4 def failed")); 181 182 snprintf(str, strsz, fmt, def, val); 183 buf_append(buf, &str, 1); 184 return buf; 185 } 186 187 /** Pushes "m4_undefine([[def]])m4_dnl" to end of buffer. 188 * @param buf A buffer as a list of strings. 189 * @param def The m4 symbol to undefine. 190 * @return buf 191 */ 192 struct Buf *buf_m4_undefine (struct Buf *buf, const char* def) 193 { 194 const char * fmt = "m4_undefine( [[%s]])m4_dnl\n"; 195 char * str; 196 size_t strsz; 197 198 strsz = strlen(fmt) + strlen(def) + 2; 199 str = malloc(strsz); 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. */ 209 void buf_init (struct Buf *buf, size_t elem_size) 210 { 211 buf->elts = NULL; 212 buf->nelts = 0; 213 buf->elt_size = elem_size; 214 buf->nmax = 0; 215 } 216 217 /* frees memory */ 218 void buf_destroy (struct Buf *buf) 219 { 220 if (buf) { 221 free(buf->elts); 222 buf->elts = NULL; 223 } 224 } 225 226 227 /* appends ptr[] to buf, grow if necessary. 228 * n_elem is number of elements in ptr[], NOT bytes. 229 * returns buf. 230 * We grow by mod(512) boundaries. 231 */ 232 233 struct Buf *buf_append (struct Buf *buf, const void *ptr, int n_elem) 234 { 235 int n_alloc = 0; 236 237 if (!ptr || n_elem == 0) 238 return buf; 239 240 /* May need to alloc more. */ 241 if (n_elem + buf->nelts > buf->nmax) { 242 243 /* exact count needed... */ 244 n_alloc = n_elem + buf->nelts; 245 246 /* ...plus some extra */ 247 if ((((size_t) n_alloc * buf->elt_size) % 512) != 0 248 && buf->elt_size < 512) 249 n_alloc += (int) 250 ((512 - 251 (((size_t) n_alloc * buf->elt_size) % 512)) / 252 buf->elt_size); 253 254 if (!buf->elts) 255 buf->elts = 256 allocate_array ((int) n_alloc, buf->elt_size); 257 else 258 buf->elts = 259 reallocate_array (buf->elts, (int) n_alloc, 260 buf->elt_size); 261 262 buf->nmax = n_alloc; 263 } 264 265 memcpy ((char *) buf->elts + (size_t) buf->nelts * buf->elt_size, ptr, 266 (size_t) n_elem * buf->elt_size); 267 buf->nelts += n_elem; 268 269 return buf; 270 } 271 272 /* vim:set tabstop=8 softtabstop=4 shiftwidth=4: */ 273