275 lines
7.5 KiB
C
275 lines
7.5 KiB
C
/* flex - tool to generate fast lexical analyzers */
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/* Copyright (c) 1990 The Regents of the University of California. */
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/* All rights reserved. */
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/* This code is derived from software contributed to Berkeley by */
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/* Vern Paxson. */
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/* The United States Government has rights in this work pursuant */
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/* to contract no. DE-AC03-76SF00098 between the United States */
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/* Department of Energy and the University of California. */
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/* This file is part of flex. */
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/* Redistribution and use in source and binary forms, with or without */
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/* modification, are permitted provided that the following conditions */
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/* are met: */
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/* 1. Redistributions of source code must retain the above copyright */
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/* notice, this list of conditions and the following disclaimer. */
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/* 2. Redistributions in binary form must reproduce the above copyright */
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/* notice, this list of conditions and the following disclaimer in the */
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/* documentation and/or other materials provided with the distribution. */
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/* Neither the name of the University nor the names of its contributors */
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/* may be used to endorse or promote products derived from this software */
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/* without specific prior written permission. */
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/* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
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/* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
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/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
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/* PURPOSE. */
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#include "flexdef.h"
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/* Take note: The buffer object is sometimes used as a String buffer (one
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* continuous string), and sometimes used as a list of strings, usually line by
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* line.
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*
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* The type is specified in buf_init by the elt_size. If the elt_size is
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* sizeof(char), then the buffer should be treated as string buffer. If the
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* elt_size is sizeof(char*), then the buffer should be treated as a list of
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* strings.
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*
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* Certain functions are only appropriate for one type or the other.
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*/
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/* global buffers. */
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struct Buf userdef_buf; /**< for user #definitions triggered by cmd-line. */
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struct Buf defs_buf; /**< for #define's autogenerated. List of strings. */
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struct Buf yydmap_buf; /**< string buffer to hold yydmap elements */
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struct Buf m4defs_buf; /**< m4 definitions. List of strings. */
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struct Buf top_buf; /**< contains %top code. String buffer. */
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struct Buf *buf_print_strings(struct Buf * buf, FILE* out)
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{
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int i;
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if(!buf || !out)
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return buf;
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for (i=0; i < buf->nelts; i++){
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const char * s = ((char**)buf->elts)[i];
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if(s)
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fprintf(out, "%s", s);
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}
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return buf;
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}
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/* Append a "%s" formatted string to a string buffer */
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struct Buf *buf_prints (struct Buf *buf, const char *fmt, const char *s)
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{
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char *t;
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size_t tsz;
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t = flex_alloc (tsz = strlen (fmt) + strlen (s) + 1);
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if (!t)
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flexfatal (_("Allocation of buffer to print string failed"));
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snprintf (t, tsz, fmt, s);
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buf = buf_strappend (buf, t);
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flex_free (t);
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return buf;
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}
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/** Append a line directive to the string buffer.
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* @param buf A string buffer.
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* @param filename file name
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* @param lineno line number
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* @return buf
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*/
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struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno)
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{
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char *dst, *t;
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const char *src;
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t = flex_alloc (strlen ("#line \"\"\n") + /* constant parts */
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2 * strlen (filename) + /* filename with possibly all backslashes escaped */
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NUMCHARLINES + /* line number */
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1); /* NUL */
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if (!t)
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flexfatal (_("Allocation of buffer for line directive failed"));
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for (dst = t + sprintf (t, "#line %d \"", lineno), src = filename; *src; *dst++ = *src++)
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if (*src == '\\') /* escape backslashes */
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*dst++ = '\\';
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*dst++ = '"';
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*dst++ = '\n';
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*dst = '\0';
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buf = buf_strappend (buf, t);
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flex_free (t);
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return buf;
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}
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/** Append the contents of @a src to @a dest.
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* @param @a dest the destination buffer
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* @param @a dest the source buffer
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* @return @a dest
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*/
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struct Buf *buf_concat(struct Buf* dest, const struct Buf* src)
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{
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buf_append(dest, src->elts, src->nelts);
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return dest;
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}
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/* Appends n characters in str to buf. */
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struct Buf *buf_strnappend (buf, str, n)
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struct Buf *buf;
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const char *str;
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int n;
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{
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buf_append (buf, str, n + 1);
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/* "undo" the '\0' character that buf_append() already copied. */
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buf->nelts--;
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return buf;
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}
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/* Appends characters in str to buf. */
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struct Buf *buf_strappend (buf, str)
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struct Buf *buf;
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const char *str;
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{
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return buf_strnappend (buf, str, strlen (str));
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}
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/* appends "#define str def\n" */
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struct Buf *buf_strdefine (buf, str, def)
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struct Buf *buf;
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const char *str;
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const char *def;
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{
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buf_strappend (buf, "#define ");
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buf_strappend (buf, " ");
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buf_strappend (buf, str);
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buf_strappend (buf, " ");
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buf_strappend (buf, def);
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buf_strappend (buf, "\n");
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return buf;
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}
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/** Pushes "m4_define( [[def]], [[val]])m4_dnl" to end of buffer.
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* @param buf A buffer as a list of strings.
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* @param def The m4 symbol to define.
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* @param val The definition; may be NULL.
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* @return buf
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*/
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struct Buf *buf_m4_define (struct Buf *buf, const char* def, const char* val)
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{
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const char * fmt = "m4_define( [[%s]], [[%s]])m4_dnl\n";
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char * str;
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size_t strsz;
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val = val?val:"";
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str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + strlen(val) + 2);
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if (!str)
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flexfatal (_("Allocation of buffer for m4 def failed"));
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snprintf(str, strsz, fmt, def, val);
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buf_append(buf, &str, 1);
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return buf;
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}
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/** Pushes "m4_undefine([[def]])m4_dnl" to end of buffer.
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* @param buf A buffer as a list of strings.
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* @param def The m4 symbol to undefine.
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* @return buf
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*/
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struct Buf *buf_m4_undefine (struct Buf *buf, const char* def)
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{
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const char * fmt = "m4_undefine( [[%s]])m4_dnl\n";
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char * str;
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size_t strsz;
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str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + 2);
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if (!str)
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flexfatal (_("Allocation of buffer for m4 undef failed"));
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snprintf(str, strsz, fmt, def);
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buf_append(buf, &str, 1);
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return buf;
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}
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/* create buf with 0 elements, each of size elem_size. */
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void buf_init (buf, elem_size)
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struct Buf *buf;
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size_t elem_size;
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{
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buf->elts = (void *) 0;
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buf->nelts = 0;
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buf->elt_size = elem_size;
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buf->nmax = 0;
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}
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/* frees memory */
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void buf_destroy (buf)
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struct Buf *buf;
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{
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if (buf && buf->elts)
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flex_free (buf->elts);
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buf->elts = (void *) 0;
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}
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/* appends ptr[] to buf, grow if necessary.
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* n_elem is number of elements in ptr[], NOT bytes.
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* returns buf.
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* We grow by mod(512) boundaries.
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*/
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struct Buf *buf_append (buf, ptr, n_elem)
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struct Buf *buf;
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const void *ptr;
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int n_elem;
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{
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int n_alloc = 0;
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if (!ptr || n_elem == 0)
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return buf;
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/* May need to alloc more. */
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if (n_elem + buf->nelts > buf->nmax) {
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/* exact amount needed... */
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n_alloc = (n_elem + buf->nelts) * buf->elt_size;
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/* ...plus some extra */
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if (((n_alloc * buf->elt_size) % 512) != 0
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&& buf->elt_size < 512)
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n_alloc +=
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(512 -
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((n_alloc * buf->elt_size) % 512)) /
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buf->elt_size;
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if (!buf->elts)
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buf->elts =
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allocate_array (n_alloc, buf->elt_size);
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else
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buf->elts =
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reallocate_array (buf->elts, n_alloc,
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buf->elt_size);
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buf->nmax = n_alloc;
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}
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memcpy ((char *) buf->elts + buf->nelts * buf->elt_size, ptr,
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n_elem * buf->elt_size);
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buf->nelts += n_elem;
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return buf;
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}
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/* vim:set tabstop=8 softtabstop=4 shiftwidth=4: */
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