-/* Copyright (C) 1995,1996,1998,2000 Free Software Foundation, Inc.
- *
- * This program 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 2, or (at your option)
- * any later version.
- *
- * This program 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 software; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
- * Boston, MA 02111-1307 USA
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * If you write modifications of your own for GUILE, it is your choice
- * whether to permit this exception to apply to your modifications.
- * If you do not wish that, delete this exception notice. */
-
-/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
- gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
-
-\f
-
-#include <stdio.h>
-#include <string.h>
-
-#include "libguile/_scm.h"
-#include "libguile/chars.h"
-
-#include "libguile/strings.h"
-#include "libguile/validate.h"
-\f
-
-/* {Strings}
- */
-
-SCM_DEFINE (scm_string_p, "string?", 1, 0, 0,
- (SCM obj),
- "Returns #t iff OBJ is a string, else returns #f.")
-#define FUNC_NAME s_scm_string_p
-{
- return SCM_BOOL(SCM_STRINGP (obj));
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_read_only_string_p, "read-only-string?", 1, 0, 0,
- (SCM x),
- "Return true if OBJ can be read as a string,\n\n"
- "This illustrates the difference between @code{string?} and\n"
- "@code{read-only-string?}:\n\n"
- "@example\n"
- "(string? \"a string\") @result{} #t\n"
- "(string? 'a-symbol) @result{} #f\n\n"
- "(read-only-string? \"a string\") @result{} #t\n"
- "(read-only-string? 'a-symbol) @result{} #t\n"
- "@end example")
-#define FUNC_NAME s_scm_read_only_string_p
-{
- return SCM_BOOL(SCM_ROSTRINGP (x));
-}
-#undef FUNC_NAME
-
-SCM_REGISTER_PROC (s_scm_list_to_string, "list->string", 1, 0, 0, scm_string);
-
-SCM_DEFINE (scm_string, "string", 0, 0, 1,
- (SCM chrs),
- "Returns a newly allocated string composed of the arguments, CHRS.")
-#define FUNC_NAME s_scm_string
-{
- SCM result;
-
- {
- long i = scm_ilength (chrs);
-
- SCM_ASSERT (i >= 0, chrs, SCM_ARGn, FUNC_NAME);
- result = scm_makstr (i, 0);
- }
-
- {
- unsigned char *data = SCM_UCHARS (result);
-
- while (SCM_NNULLP (chrs))
- {
- SCM elt = SCM_CAR (chrs);
-
- SCM_VALIDATE_CHAR (SCM_ARGn, elt);
- *data++ = SCM_CHAR (elt);
- chrs = SCM_CDR (chrs);
- }
- }
- return result;
-}
-#undef FUNC_NAME
-
-SCM
-scm_makstr (long len, int slots)
-{
- SCM s;
- scm_bits_t * mem;
-
- SCM_NEWCELL (s);
- --slots;
- SCM_REDEFER_INTS;
- mem = (scm_bits_t *) scm_must_malloc (sizeof (scm_bits_t) * (slots + 1)
- + len + 1, "scm_makstr");
- if (slots >= 0)
- {
- int x;
- mem[slots] = (scm_bits_t) mem;
- for (x = 0; x < slots; ++x)
- mem[x] = SCM_UNPACK (SCM_BOOL_F);
- }
- SCM_SETCHARS (s, (char *) (mem + slots + 1));
- SCM_SETLENGTH (s, len, scm_tc7_string);
- SCM_REALLOW_INTS;
- SCM_CHARS (s)[len] = 0;
- return s;
-}
-
-/* converts C scm_array of strings to SCM scm_list of strings. */
-/* If argc < 0, a null terminated scm_array is assumed. */
-
-SCM
-scm_makfromstrs (int argc, char **argv)
-{
- int i = argc;
- SCM lst = SCM_EOL;
- if (0 > i)
- for (i = 0; argv[i]; i++);
- while (i--)
- lst = scm_cons (scm_makfromstr (argv[i], (scm_sizet) strlen (argv[i]), 0), lst);
- return lst;
-}
-
-
-/* This function must only be applied to memory obtained via malloc,
- since the GC is going to apply `free' to it when the string is
- dropped.
-
- Also, s[len] must be `\0', since we promise that strings are
- null-terminated. Perhaps we could handle non-null-terminated
- strings by claiming they're shared substrings of a string we just
- made up. */
-SCM
-scm_take_str (char *s, int len)
-{
- SCM answer;
- SCM_NEWCELL (answer);
- SCM_DEFER_INTS;
- SCM_SETLENGTH (answer, len, scm_tc7_string);
- scm_done_malloc (len + 1);
- SCM_SETCHARS (answer, s);
- SCM_ALLOW_INTS;
- return answer;
-}
-
-/* `s' must be a malloc'd string. See scm_take_str. */
-SCM
-scm_take0str (char *s)
-{
- return scm_take_str (s, strlen (s));
-}
-
-SCM
-scm_makfromstr (const char *src, scm_sizet len, int slots)
-{
- SCM s = scm_makstr (len, slots);
- char *dst = SCM_CHARS (s);
-
- while (len--)
- *dst++ = *src++;
- return s;
-}
-
-SCM
-scm_makfrom0str (const char *src)
-{
- if (!src) return SCM_BOOL_F;
- return scm_makfromstr (src, (scm_sizet) strlen (src), 0);
-}
-
-
-SCM
-scm_makfrom0str_opt (const char *src)
-{
- return scm_makfrom0str (src);
-}
-
-
-
-
-SCM_DEFINE (scm_make_string, "make-string", 1, 1, 0,
- (SCM k, SCM chr),
- "Returns a newly allocated string of\n"
- "length K. If CHR is given, then all elements of the string\n"
- "are initialized to CHR, otherwise the contents of the\n"
- "STRING are unspecified.\n")
-#define FUNC_NAME s_scm_make_string
-{
- SCM res;
- register long i;
- SCM_VALIDATE_INUM_MIN_COPY (1,k,0,i);
- res = scm_makstr (i, 0);
- if (!SCM_UNBNDP (chr))
- {
- SCM_VALIDATE_CHAR (2,chr);
- {
- unsigned char *dst = SCM_UCHARS (res);
- char c = SCM_CHAR (chr);
-
- memset (dst, c, i);
- }
- }
- return res;
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_string_length, "string-length", 1, 0, 0,
- (SCM string),
- "Returns the number of characters in STRING")
-#define FUNC_NAME s_scm_string_length
-{
- SCM_VALIDATE_ROSTRING (1,string);
- return SCM_MAKINUM (SCM_ROLENGTH (string));
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_string_ref, "string-ref", 2, 0, 0,
- (SCM str, SCM k),
- "Returns character K of STR using zero-origin indexing.\n"
- "K must be a valid index of STR.")
-#define FUNC_NAME s_scm_string_ref
-{
- int idx;
-
- SCM_VALIDATE_ROSTRING (1, str);
- SCM_VALIDATE_INUM_COPY (2, k, idx);
- SCM_ASSERT_RANGE (2, k, idx >= 0 && idx < SCM_ROLENGTH (str));
- return SCM_MAKE_CHAR (SCM_ROUCHARS (str)[idx]);
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_string_set_x, "string-set!", 3, 0, 0,
- (SCM str, SCM k, SCM chr),
- "Stores CHR in element K of STRING and returns an unspecified value.\n"
- "K must be a valid index of STR.")
-#define FUNC_NAME s_scm_string_set_x
-{
- SCM_VALIDATE_RWSTRING (1,str);
- SCM_VALIDATE_INUM_RANGE (2,k,0,SCM_LENGTH(str));
- SCM_VALIDATE_CHAR (3,chr);
- SCM_UCHARS (str)[SCM_INUM (k)] = SCM_CHAR (chr);
- return SCM_UNSPECIFIED;
-}
-#undef FUNC_NAME
-
-
-SCM_DEFINE (scm_substring, "substring", 2, 1, 0,
- (SCM str, SCM start, SCM end),
- "Returns a newly allocated string formed from the characters\n"
- "of STR beginning with index START (inclusive) and ending with\n"
- "index END (exclusive).\n"
- "STR must be a string, START and END must be exact integers satisfying:\n\n"
- "0 <= START <= END <= (string-length STR).")
-#define FUNC_NAME s_scm_substring
-{
- long int from;
- long int to;
-
- SCM_VALIDATE_ROSTRING (1,str);
- SCM_VALIDATE_INUM (2, start);
- SCM_VALIDATE_INUM_DEF (3,end,SCM_ROLENGTH(str));
-
- from = SCM_INUM (start);
- SCM_ASSERT_RANGE (2, start, 0 <= from && from <= SCM_ROLENGTH (str));
- to = SCM_INUM (end);
- SCM_ASSERT_RANGE (3, end, from <= to && to <= SCM_ROLENGTH (str));
-
- return scm_makfromstr (&SCM_ROCHARS (str)[from], (scm_sizet) (to - from), 0);
-}
-#undef FUNC_NAME
-
-
-SCM_DEFINE (scm_string_append, "string-append", 0, 0, 1,
- (SCM args),
- "Returns a newly allocated string whose characters form the\n"
- "concatenation of the given strings, ARGS.")
-#define FUNC_NAME s_scm_string_append
-{
- SCM res;
- register long i = 0;
- register SCM l, s;
- register unsigned char *data;
-
- SCM_VALIDATE_REST_ARGUMENT (args);
- for (l = args; !SCM_NULLP (l); l = SCM_CDR (l)) {
- s = SCM_CAR (l);
- SCM_VALIDATE_ROSTRING (SCM_ARGn,s);
- i += SCM_ROLENGTH (s);
- }
- res = scm_makstr (i, 0);
- data = SCM_UCHARS (res);
- for (l = args;SCM_NIMP (l);l = SCM_CDR (l)) {
- s = SCM_CAR (l);
- for (i = 0;i<SCM_ROLENGTH (s);i++) *data++ = SCM_ROUCHARS (s)[i];
- }
- return res;
-}
-#undef FUNC_NAME
-
-SCM_DEFINE (scm_make_shared_substring, "make-shared-substring", 1, 2, 0,
- (SCM str, SCM frm, SCM to),
- "Return a shared substring of @var{str}. The semantics are the same as\n"
- "for the @code{substring} function: the shared substring returned\n"
- "includes all of the text from @var{str} between indexes @var{start}\n"
- "(inclusive) and @var{end} (exclusive). If @var{end} is omitted, it\n"
- "defaults to the end of @var{str}. The shared substring returned by\n"
- "@code{make-shared-substring} occupies the same storage space as\n"
- "@var{str}.")
-#define FUNC_NAME s_scm_make_shared_substring
-{
- long f;
- long t;
- SCM answer;
- SCM len_str;
-
- SCM_VALIDATE_ROSTRING (1,str);
- SCM_VALIDATE_INUM_DEF_COPY (2,frm,0,f);
- SCM_VALIDATE_INUM_DEF_COPY (3,to,SCM_ROLENGTH(str),t);
-
- SCM_ASSERT_RANGE (2,frm,(f >= 0));
- SCM_ASSERT_RANGE (3,to, (f <= t) && (t <= SCM_ROLENGTH (str)));
-
- SCM_NEWCELL (answer);
- SCM_NEWCELL (len_str);
-
- SCM_DEFER_INTS;
- if (SCM_SUBSTRP (str))
- {
- long offset;
- offset = SCM_INUM (SCM_SUBSTR_OFFSET (str));
- f += offset;
- t += offset;
- SCM_SETCAR (len_str, SCM_MAKINUM (f));
- SCM_SETCDR (len_str, SCM_SUBSTR_STR (str));
- SCM_SETCDR (answer, len_str);
- SCM_SETLENGTH (answer, t - f, scm_tc7_substring);
- }
- else
- {
- SCM_SETCAR (len_str, SCM_MAKINUM (f));
- SCM_SETCDR (len_str, str);
- SCM_SETCDR (answer, len_str);
- SCM_SETLENGTH (answer, t - f, scm_tc7_substring);
- }
- SCM_ALLOW_INTS;
- return answer;
-}
-#undef FUNC_NAME
-
-void
-scm_init_strings ()
-{
-#include "libguile/strings.x"
-}
-
-
-/*
- Local Variables:
- c-file-style: "gnu"
- End:
-*/
+/* Copyright (C) 1995,1996,1998,2000,2001 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+
+\f
+
+#include <string.h>
+
+#include "libguile/_scm.h"
+#include "libguile/chars.h"
+#include "libguile/root.h"
+#include "libguile/strings.h"
+#include "libguile/deprecation.h"
+#include "libguile/validate.h"
+
+\f
+
+/* {Strings}
+ */
+
+SCM_DEFINE (scm_string_p, "string?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} if @var{obj} is a string, else @code{#f}.")
+#define FUNC_NAME s_scm_string_p
+{
+ return SCM_BOOL (SCM_STRINGP (obj));
+}
+#undef FUNC_NAME
+
+
+SCM_REGISTER_PROC (s_scm_list_to_string, "list->string", 1, 0, 0, scm_string);
+
+SCM_DEFINE (scm_string, "string", 0, 0, 1,
+ (SCM chrs),
+ "@deffnx {Scheme Procedure} list->string chrs\n"
+ "Return a newly allocated string composed of the arguments,\n"
+ "@var{chrs}.")
+#define FUNC_NAME s_scm_string
+{
+ SCM result;
+
+ {
+ long i = scm_ilength (chrs);
+
+ SCM_ASSERT (i >= 0, chrs, SCM_ARG1, FUNC_NAME);
+ result = scm_allocate_string (i);
+ }
+
+ {
+ unsigned char *data = SCM_STRING_UCHARS (result);
+
+ while (!SCM_NULLP (chrs))
+ {
+ SCM elt = SCM_CAR (chrs);
+
+ SCM_VALIDATE_CHAR (SCM_ARGn, elt);
+ *data++ = SCM_CHAR (elt);
+ chrs = SCM_CDR (chrs);
+ }
+ }
+ return result;
+}
+#undef FUNC_NAME
+
+
+/* converts C scm_array of strings to SCM scm_list of strings. */
+/* If argc < 0, a null terminated scm_array is assumed. */
+SCM
+scm_makfromstrs (int argc, char **argv)
+{
+ int i = argc;
+ SCM lst = SCM_EOL;
+ if (0 > i)
+ for (i = 0; argv[i]; i++);
+ while (i--)
+ lst = scm_cons (scm_mem2string (argv[i], strlen (argv[i])), lst);
+ return lst;
+}
+
+
+/* This function must only be applied to memory obtained via malloc,
+ since the GC is going to apply `free' to it when the string is
+ dropped.
+
+ Also, s[len] must be `\0', since we promise that strings are
+ null-terminated. Perhaps we could handle non-null-terminated
+ strings by claiming they're shared substrings of a string we just
+ made up. */
+SCM
+scm_take_str (char *s, size_t len)
+#define FUNC_NAME "scm_take_str"
+{
+ SCM answer;
+
+ SCM_ASSERT_RANGE (2, scm_ulong2num (len), len <= SCM_STRING_MAX_LENGTH);
+
+ answer = scm_cell (SCM_MAKE_STRING_TAG (len), (scm_t_bits) s);
+ scm_gc_register_collectable_memory (s, len+1, "string");
+
+ return answer;
+}
+#undef FUNC_NAME
+
+
+/* `s' must be a malloc'd string. See scm_take_str. */
+SCM
+scm_take0str (char *s)
+{
+ return scm_take_str (s, strlen (s));
+}
+
+
+SCM
+scm_mem2string (const char *src, size_t len)
+{
+ SCM s = scm_allocate_string (len);
+ char *dst = SCM_STRING_CHARS (s);
+ memcpy (dst, src, len);
+ return s;
+}
+
+
+SCM
+scm_str2string (const char *src)
+{
+ return scm_mem2string (src, strlen (src));
+}
+
+
+SCM
+scm_makfrom0str (const char *src)
+{
+ if (!src) return SCM_BOOL_F;
+ return scm_mem2string (src, strlen (src));
+}
+
+
+SCM
+scm_makfrom0str_opt (const char *src)
+{
+ return scm_makfrom0str (src);
+}
+
+
+SCM
+scm_allocate_string (size_t len)
+#define FUNC_NAME "scm_allocate_string"
+{
+ char *mem;
+ SCM s;
+
+ SCM_ASSERT_RANGE (1, scm_long2num (len), len <= SCM_STRING_MAX_LENGTH);
+
+ mem = (char *) scm_gc_malloc (len + 1, "string");
+ mem[len] = 0;
+
+ s = scm_cell (SCM_MAKE_STRING_TAG (len), (scm_t_bits) mem);
+
+ return s;
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_make_string, "make-string", 1, 1, 0,
+ (SCM k, SCM chr),
+ "Return a newly allocated string of\n"
+ "length @var{k}. If @var{chr} is given, then all elements of\n"
+ "the string are initialized to @var{chr}, otherwise the contents\n"
+ "of the @var{string} are unspecified.")
+#define FUNC_NAME s_scm_make_string
+{
+ if (SCM_INUMP (k))
+ {
+ long int i = SCM_INUM (k);
+ SCM res;
+
+ SCM_ASSERT_RANGE (1, k, i >= 0);
+
+ res = scm_allocate_string (i);
+ if (!SCM_UNBNDP (chr))
+ {
+ unsigned char *dst;
+
+ SCM_VALIDATE_CHAR (2, chr);
+
+ dst = SCM_STRING_UCHARS (res);
+ memset (dst, SCM_CHAR (chr), i);
+ }
+
+ return res;
+ }
+ else if (SCM_BIGP (k))
+ SCM_OUT_OF_RANGE (1, k);
+ else
+ SCM_WRONG_TYPE_ARG (1, k);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_string_length, "string-length", 1, 0, 0,
+ (SCM string),
+ "Return the number of characters in @var{string}.")
+#define FUNC_NAME s_scm_string_length
+{
+ SCM_VALIDATE_STRING (1, string);
+ return SCM_MAKINUM (SCM_STRING_LENGTH (string));
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_string_ref, "string-ref", 2, 0, 0,
+ (SCM str, SCM k),
+ "Return character @var{k} of @var{str} using zero-origin\n"
+ "indexing. @var{k} must be a valid index of @var{str}.")
+#define FUNC_NAME s_scm_string_ref
+{
+ long idx;
+
+ SCM_VALIDATE_STRING (1, str);
+ SCM_VALIDATE_INUM_COPY (2, k, idx);
+ SCM_ASSERT_RANGE (2, k, idx >= 0 && idx < SCM_STRING_LENGTH (str));
+ return SCM_MAKE_CHAR (SCM_STRING_UCHARS (str)[idx]);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_string_set_x, "string-set!", 3, 0, 0,
+ (SCM str, SCM k, SCM chr),
+ "Store @var{chr} in element @var{k} of @var{str} and return\n"
+ "an unspecified value. @var{k} must be a valid index of\n"
+ "@var{str}.")
+#define FUNC_NAME s_scm_string_set_x
+{
+ SCM_VALIDATE_STRING (1, str);
+ SCM_VALIDATE_INUM_RANGE (2, k,0, SCM_STRING_LENGTH(str));
+ SCM_VALIDATE_CHAR (3, chr);
+ SCM_STRING_UCHARS (str)[SCM_INUM (k)] = SCM_CHAR (chr);
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_substring, "substring", 2, 1, 0,
+ (SCM str, SCM start, SCM end),
+ "Return a newly allocated string formed from the characters\n"
+ "of @var{str} beginning with index @var{start} (inclusive) and\n"
+ "ending with index @var{end} (exclusive).\n"
+ "@var{str} must be a string, @var{start} and @var{end} must be\n"
+ "exact integers satisfying:\n\n"
+ "0 <= @var{start} <= @var{end} <= (string-length @var{str}).")
+#define FUNC_NAME s_scm_substring
+{
+ long int from;
+ long int to;
+ SCM substr;
+
+ SCM_VALIDATE_STRING (1, str);
+ SCM_VALIDATE_INUM (2, start);
+ SCM_VALIDATE_INUM_DEF (3, end, SCM_STRING_LENGTH (str));
+
+ from = SCM_INUM (start);
+ SCM_ASSERT_RANGE (2, start, 0 <= from && from <= SCM_STRING_LENGTH (str));
+ to = SCM_INUM (end);
+ SCM_ASSERT_RANGE (3, end, from <= to && to <= SCM_STRING_LENGTH (str));
+
+ substr = scm_mem2string (&SCM_STRING_CHARS (str)[from], to - from);
+ scm_remember_upto_here_1 (str);
+ return substr;
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_string_append, "string-append", 0, 0, 1,
+ (SCM args),
+ "Return a newly allocated string whose characters form the\n"
+ "concatenation of the given strings, @var{args}.")
+#define FUNC_NAME s_scm_string_append
+{
+ SCM res;
+ size_t i = 0;
+ register SCM l, s;
+ register unsigned char *data;
+
+ SCM_VALIDATE_REST_ARGUMENT (args);
+ for (l = args; !SCM_NULLP (l); l = SCM_CDR (l)) {
+ s = SCM_CAR (l);
+ SCM_VALIDATE_STRING (SCM_ARGn, s);
+ i += SCM_STRING_LENGTH (s);
+ }
+ res = scm_allocate_string (i);
+ data = SCM_STRING_UCHARS (res);
+ for (l = args; !SCM_NULLP (l);l = SCM_CDR (l)) {
+ s = SCM_CAR (l);
+ for (i = 0;i<SCM_STRING_LENGTH (s);i++) *data++ = SCM_STRING_UCHARS (s)[i];
+ }
+ return res;
+}
+#undef FUNC_NAME
+
+
+/* Converts the given Scheme string OBJ into a C string, containing a copy
+ of OBJ's content with a trailing null byte. If LENP is non-NULL, set
+ *LENP to the string's length.
+
+ When STR is non-NULL it receives the copy and is returned by the function,
+ otherwise new memory is allocated and the caller is responsible for
+ freeing it via free(). If out of memory, NULL is returned.
+
+ Note that Scheme strings may contain arbitrary data, including null
+ characters. This means that null termination is not a reliable way to
+ determine the length of the returned value. However, the function always
+ copies the complete contents of OBJ, and sets *LENP to the length of the
+ scheme string (if LENP is non-null). */
+#define FUNC_NAME "scm_c_string2str"
+char *
+scm_c_string2str (SCM obj, char *str, size_t *lenp)
+{
+ size_t len;
+
+ SCM_ASSERT (SCM_STRINGP (obj), obj, SCM_ARG1, FUNC_NAME);
+ len = SCM_STRING_LENGTH (obj);
+
+ if (str == NULL)
+ {
+ /* FIXME: Should we use exported wrappers for malloc (and free), which
+ * allow windows DLLs to call the correct freeing function? */
+ str = (char *) scm_malloc ((len + 1) * sizeof (char));
+ if (str == NULL)
+ return NULL;
+ }
+
+ memcpy (str, SCM_STRING_CHARS (obj), len);
+ scm_remember_upto_here_1 (obj);
+ str[len] = '\0';
+
+ if (lenp != NULL)
+ *lenp = len;
+
+ return str;
+}
+#undef FUNC_NAME
+
+
+/* Copy LEN characters at START from the Scheme string OBJ to memory
+ at STR. START is an index into OBJ; zero means the beginning of
+ the string. STR has already been allocated by the caller.
+
+ If START + LEN is off the end of OBJ, silently truncate the source
+ region to fit the string. If truncation occurs, the corresponding
+ area of STR is left unchanged. */
+#define FUNC_NAME "scm_c_substring2str"
+char *
+scm_c_substring2str (SCM obj, char *str, size_t start, size_t len)
+{
+ size_t src_length, effective_length;
+
+ SCM_ASSERT (SCM_STRINGP (obj), obj, SCM_ARG2, FUNC_NAME);
+ src_length = SCM_STRING_LENGTH (obj);
+ effective_length = (len + start <= src_length) ? len : src_length - start;
+ memcpy (str, SCM_STRING_CHARS (obj) + start, effective_length);
+ scm_remember_upto_here_1 (obj);
+ return str;
+}
+#undef FUNC_NAME
+
+
+void
+scm_init_strings ()
+{
+ scm_nullstr = scm_allocate_string (0);
+
+#include "libguile/strings.x"
+}
+
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff