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/**
* @file scmStrings.c
*
* Temporary SCM strings.
*
* Time-stamp: "2012-08-11 08:29:47 bkorb"
*
* This file is part of AutoGen.
* AutoGen Copyright (c) 1992-2012 by Bruce Korb - all rights reserved
*
* AutoGen is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* AutoGen is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#define ROUND_SCRIBBLE(_v, _sz) (((_v) + ((_sz) - 1)) & ~((_sz) - 1))
typedef struct string_buf_s string_buf_t;
struct string_buf_s {
string_buf_t * next_p;
ssize_t const sb_size;
ssize_t sb_off;
unsigned char sb_buf[1];
};
static string_buf_t * ag_strbufs = NULL;
static string_buf_t ** next_strbuf = &ag_strbufs;
static size_t const str_buf_hdr_sz =
(&(((string_buf_t *)NULL)->sb_buf[0])) - ((unsigned char *)NULL);
/**
* Initialize the scribble string library
*/
LOCAL void
ag_scribble_init(void)
{
ag_strbufs = NULL;
next_strbuf = &ag_strbufs;
}
/**
* Free up the scribble strings memory pool.
*/
LOCAL void
ag_scribble_deinit(void)
{
string_buf_t* sb = ag_strbufs;
ag_scribble_init();
while (sb != NULL) {
string_buf_t* sb_next_p = sb->next_p;
free(sb);
sb = sb_next_p;
}
}
/**
* Free up the scribble strings used during the processing of one macro.
*/
LOCAL void
ag_scribble_free(void)
{
string_buf_t* sb = ag_strbufs;
while (sb != NULL) {
sb->sb_off = 0;
sb = sb->next_p;
}
}
/**
* allocate a new scribble block. Multiple of 8K bytes.
*/
static string_buf_t *
new_scribble_block(size_t min_size)
{
string_buf_t * res = NULL;
/*
* allow space for allocation header and round up
*/
min_size += str_buf_hdr_sz;
min_size = ROUND_SCRIBBLE(min_size, 0x2000);
/*
* Allocate and link into list. Advance pointer to next entry.
*/
*next_strbuf = res = AGALOC(min_size, "scribble buf");
next_strbuf = &(res->next_p);
res->next_p = NULL;
res->sb_off = 0;
/*
* The "sb_size" field is read-only. Override this.
*/
{
size_t * psz = (void *)&(res->sb_size);
*psz = min_size - str_buf_hdr_sz;
}
return res;
}
/**
* Allocate a scribble string. It will be deallocated when a macro finishes.
* Therefore, *DO NOT* use these at the start of a block macro expecting
* the space to still be usable at the end of the block macro.
* These allocations are intended for temporary space needs that cannot
* be kept on the stack. Expression processing.
*
* @param size the number of bytes needed
* @return the memory as a pointer to character
*/
LOCAL char *
ag_scribble(ssize_t size)
{
string_buf_t* sb = ag_strbufs;
char* buf;
size += 1; // allow for NUL byte & round to word boundary
size = ROUND_SCRIBBLE(size, sizeof(void *));
for (;;) {
if (sb == NULL) {
sb = new_scribble_block(size);
break;
}
if ((sb->sb_size - sb->sb_off) >= size)
break;
sb = sb->next_p;
}
buf = (char*)(sb->sb_buf + sb->sb_off);
sb->sb_off += size;
return buf;
}
/**
* As of Guile 1.7.x, access to the NUL terminated string referenced by
* an SCM is no longer guaranteed. Therefore, we must extract the string
* into one of our "scribble" buffers.
*
* @param s the string to convert
* @param type a string describing the string
* @return a NUL terminated string, or it aborts.
*/
LOCAL char *
ag_scm2zchars(SCM s, const char * type)
{
#if GUILE_VERSION < 107000 /* pre-Guile 1.7.x */
if (! AG_SCM_STRING_P(s))
AG_ABEND(aprf(NOT_STR_FMT, type));
if (SCM_SUBSTRP(s))
s = scm_makfromstr(SCM_CHARS(s), SCM_LENGTH(s), 0);
return SCM_CHARS(s);
#else
size_t len;
char * buf;
if (! AG_SCM_STRING_P(s))
AG_ABEND(aprf(NOT_STR_FMT, type));
len = scm_c_string_length(s);
if (len == 0) {
static char z = NUL;
return &z;
}
buf = ag_scribble(len);
{
size_t buflen = scm_to_locale_stringbuf(s, buf, len);
if (buflen != len)
AG_ABEND(aprf(SCM2ZCHARS_BAD_VAL, buflen, len));
}
buf[len] = NUL;
return buf;
#endif
}
/*
* Local Variables:
* mode: C
* c-file-style: "stroustrup"
* indent-tabs-mode: nil
* End:
* end of agen5/scmStrings.c */
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