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-rw-r--r--buf.c273
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diff --git a/buf.c b/buf.c
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-/* flex - tool to generate fast lexical analyzers */
-
-/* Copyright (c) 1990 The Regents of the University of California. */
-/* All rights reserved. */
-
-/* This code is derived from software contributed to Berkeley by */
-/* Vern Paxson. */
-
-/* The United States Government has rights in this work pursuant */
-/* to contract no. DE-AC03-76SF00098 between the United States */
-/* Department of Energy and the University of California. */
-
-/* This file is part of flex. */
-
-/* Redistribution and use in source and binary forms, with or without */
-/* modification, are permitted provided that the following conditions */
-/* are met: */
-
-/* 1. Redistributions of source code must retain the above copyright */
-/* notice, this list of conditions and the following disclaimer. */
-/* 2. Redistributions in binary form must reproduce the above copyright */
-/* notice, this list of conditions and the following disclaimer in the */
-/* documentation and/or other materials provided with the distribution. */
-
-/* Neither the name of the University nor the names of its contributors */
-/* may be used to endorse or promote products derived from this software */
-/* without specific prior written permission. */
-
-/* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
-/* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
-/* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
-/* PURPOSE. */
-
-#include "flexdef.h"
-
-/* Take note: The buffer object is sometimes used as a String buffer (one
- * continuous string), and sometimes used as a list of strings, usually line by
- * line.
- *
- * The type is specified in buf_init by the elt_size. If the elt_size is
- * sizeof(char), then the buffer should be treated as string buffer. If the
- * elt_size is sizeof(char*), then the buffer should be treated as a list of
- * strings.
- *
- * Certain functions are only appropriate for one type or the other.
- */
-
-/* global buffers. */
-struct Buf userdef_buf; /**< for user #definitions triggered by cmd-line. */
-struct Buf defs_buf; /**< for #define's autogenerated. List of strings. */
-struct Buf yydmap_buf; /**< string buffer to hold yydmap elements */
-struct Buf m4defs_buf; /**< m4 definitions. List of strings. */
-struct Buf top_buf; /**< contains %top code. String buffer. */
-
-struct Buf *buf_print_strings(struct Buf * buf, FILE* out)
-{
- int i;
-
- if(!buf || !out)
- return buf;
-
- for (i=0; i < buf->nelts; i++){
- const char * s = ((char**)buf->elts)[i];
- if(s)
- fprintf(out, "%s", s);
- }
- return buf;
-}
-
-/* Append a "%s" formatted string to a string buffer */
-struct Buf *buf_prints (struct Buf *buf, const char *fmt, const char *s)
-{
- char *t;
- size_t tsz;
-
- t = flex_alloc (tsz = strlen (fmt) + strlen (s) + 1);
- if (!t)
- flexfatal (_("Allocation of buffer to print string failed"));
- snprintf (t, tsz, fmt, s);
- buf = buf_strappend (buf, t);
- flex_free (t);
- return buf;
-}
-
-/** Append a line directive to the string buffer.
- * @param buf A string buffer.
- * @param filename file name
- * @param lineno line number
- * @return buf
- */
-struct Buf *buf_linedir (struct Buf *buf, const char* filename, int lineno)
-{
- char *dst, *src, *t;
-
- t = flex_alloc (strlen ("#line \"\"\n") + /* constant parts */
- 2 * strlen (filename) + /* filename with possibly all backslashes escaped */
- (int) (1 + log10 (abs (lineno))) + /* line number */
- 1); /* NUL */
- if (!t)
- flexfatal (_("Allocation of buffer for line directive failed"));
- for (dst = t + sprintf (t, "#line %d \"", lineno), src = filename; *src; *dst++ = *src++)
- if (*src == '\\') /* escape backslashes */
- *dst++ = '\\';
- *dst++ = '"';
- *dst++ = '\n';
- *dst = '\0';
- buf = buf_strappend (buf, t);
- flex_free (t);
- return buf;
-}
-
-
-/** Append the contents of @a src to @a dest.
- * @param @a dest the destination buffer
- * @param @a dest the source buffer
- * @return @a dest
- */
-struct Buf *buf_concat(struct Buf* dest, const struct Buf* src)
-{
- buf_append(dest, src->elts, src->nelts);
- return dest;
-}
-
-
-/* Appends n characters in str to buf. */
-struct Buf *buf_strnappend (buf, str, n)
- struct Buf *buf;
- const char *str;
- int n;
-{
- buf_append (buf, str, n + 1);
-
- /* "undo" the '\0' character that buf_append() already copied. */
- buf->nelts--;
-
- return buf;
-}
-
-/* Appends characters in str to buf. */
-struct Buf *buf_strappend (buf, str)
- struct Buf *buf;
- const char *str;
-{
- return buf_strnappend (buf, str, strlen (str));
-}
-
-/* appends "#define str def\n" */
-struct Buf *buf_strdefine (buf, str, def)
- struct Buf *buf;
- const char *str;
- const char *def;
-{
- buf_strappend (buf, "#define ");
- buf_strappend (buf, " ");
- buf_strappend (buf, str);
- buf_strappend (buf, " ");
- buf_strappend (buf, def);
- buf_strappend (buf, "\n");
- return buf;
-}
-
-/** Pushes "m4_define( [[def]], [[val]])m4_dnl" to end of buffer.
- * @param buf A buffer as a list of strings.
- * @param def The m4 symbol to define.
- * @param val The definition; may be NULL.
- * @return buf
- */
-struct Buf *buf_m4_define (struct Buf *buf, const char* def, const char* val)
-{
- const char * fmt = "m4_define( [[%s]], [[%s]])m4_dnl\n";
- char * str;
- size_t strsz;
-
- val = val?val:"";
- str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + strlen(val) + 2);
- if (!str)
- flexfatal (_("Allocation of buffer for m4 def failed"));
-
- snprintf(str, strsz, fmt, def, val);
- buf_append(buf, &str, 1);
- return buf;
-}
-
-/** Pushes "m4_undefine([[def]])m4_dnl" to end of buffer.
- * @param buf A buffer as a list of strings.
- * @param def The m4 symbol to undefine.
- * @return buf
- */
-struct Buf *buf_m4_undefine (struct Buf *buf, const char* def)
-{
- const char * fmt = "m4_undefine( [[%s]])m4_dnl\n";
- char * str;
- size_t strsz;
-
- str = (char*)flex_alloc(strsz = strlen(fmt) + strlen(def) + 2);
- if (!str)
- flexfatal (_("Allocation of buffer for m4 undef failed"));
-
- snprintf(str, strsz, fmt, def);
- buf_append(buf, &str, 1);
- return buf;
-}
-
-/* create buf with 0 elements, each of size elem_size. */
-void buf_init (buf, elem_size)
- struct Buf *buf;
- size_t elem_size;
-{
- buf->elts = (void *) 0;
- buf->nelts = 0;
- buf->elt_size = elem_size;
- buf->nmax = 0;
-}
-
-/* frees memory */
-void buf_destroy (buf)
- struct Buf *buf;
-{
- if (buf && buf->elts)
- flex_free (buf->elts);
- buf->elts = (void *) 0;
-}
-
-
-/* appends ptr[] to buf, grow if necessary.
- * n_elem is number of elements in ptr[], NOT bytes.
- * returns buf.
- * We grow by mod(512) boundaries.
- */
-
-struct Buf *buf_append (buf, ptr, n_elem)
- struct Buf *buf;
- const void *ptr;
- int n_elem;
-{
- int n_alloc = 0;
-
- if (!ptr || n_elem == 0)
- return buf;
-
- /* May need to alloc more. */
- if (n_elem + buf->nelts > buf->nmax) {
-
- /* exact amount needed... */
- n_alloc = (n_elem + buf->nelts) * buf->elt_size;
-
- /* ...plus some extra */
- if (((n_alloc * buf->elt_size) % 512) != 0
- && buf->elt_size < 512)
- n_alloc +=
- (512 -
- ((n_alloc * buf->elt_size) % 512)) /
- buf->elt_size;
-
- if (!buf->elts)
- buf->elts =
- allocate_array (n_alloc, buf->elt_size);
- else
- buf->elts =
- reallocate_array (buf->elts, n_alloc,
- buf->elt_size);
-
- buf->nmax = n_alloc;
- }
-
- memcpy ((char *) buf->elts + buf->nelts * buf->elt_size, ptr,
- n_elem * buf->elt_size);
- buf->nelts += n_elem;
-
- return buf;
-}
-
-/* vim:set tabstop=8 softtabstop=4 shiftwidth=4: */
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-22 14:38:30 +0000