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/* $OpenBSD: buf.c,v 1.7 2015/11/20 18:54:49 tedu Exp $ */
/* 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;
tsz = strlen(fmt) + strlen(s) + 1;
t = malloc(tsz);
if (!t)
flexfatal(_("Allocation of buffer to print string failed"));
snprintf(t, tsz, fmt, s);
buf = buf_strappend(buf, t);
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)
{
const char *src;
char *dst, *t;
size_t tsz;
tsz = strlen("#line \"\"\n") + /* constant parts */
2 * strlen(filename) + /* filename with possibly all backslashes escaped */
(int) (1 + log10(abs(lineno))) + /* line number */
1; /* NUL */
t = malloc(tsz);
if (!t)
flexfatal(_("Allocation of buffer for line directive failed"));
dst = t + snprintf(t, tsz, "#line %d \"", lineno);
for (src = filename; *src; *dst++ = *src++)
if (*src == '\\') /* escape backslashes */
*dst++ = '\\';
*dst++ = '"';
*dst++ = '\n';
*dst = '\0';
buf = buf_strappend(buf, t);
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(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(struct Buf *buf, const char *str)
{
return buf_strnappend(buf, str, strlen(str));
}
/* appends "#define str def\n" */
struct Buf *
buf_strdefine(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 : "";
strsz = strlen(fmt) + strlen(def) + strlen(val) + 2;
str = malloc(strsz);
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;
strsz = strlen(fmt) + strlen(def) + 2;
str = malloc(strsz);
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(struct Buf *buf, size_t elem_size)
{
buf->elts = NULL;
buf->nelts = 0;
buf->elt_size = elem_size;
buf->nmax = 0;
}
/* frees memory */
void
buf_destroy(struct Buf *buf)
{
free(buf->elts);
buf->elts = NULL;
}
/* 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(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;
}
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