81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
/* cstring.c: Convert Scheme strings to C strings. The contents of strings
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* has to be copied, because strings in Elk do not have a terminating null-
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* byte (strings may _contain_ null-bytes).
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*
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* Get_String() and Get_Strsym() allocate memory in NUMSTRBUFS cyclically
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* reused buffers in the C heap.
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* The macros Get_String_Stack() and Get_Strsym_Stack() in include/cstring.h
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* allocate memory on the stack. They have to be used whenever more than
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* NUMSTRBUFS strings are active in a function at the same time.
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*
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* $Id$
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*
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* Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
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* Copyright 2002, 2003 Sam Hocevar <sam@hocevar.net>, Paris
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*
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* This software was derived from Elk 1.2, which was Copyright 1987, 1988,
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* 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
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* by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
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* between TELES and Nixdorf Microprocessor Engineering, Berlin).
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*
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* Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
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* owners or individual owners of copyright in this software, grant to any
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* person or company a worldwide, royalty free, license to
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*
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* i) copy this software,
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* ii) prepare derivative works based on this software,
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* iii) distribute copies of this software or derivative works,
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* iv) perform this software, or
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* v) display this software,
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*
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* provided that this notice is not removed and that neither Oliver Laumann
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* nor Teles nor Nixdorf are deemed to have made any representations as to
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* the suitability of this software for any purpose nor are held responsible
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* for any defects of this software.
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*
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* THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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*/
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#include "config.h"
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#include <string.h>
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#include "kernel.h"
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static char *heapstr[NUMSTRBUFS];
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static unsigned int heaplen[NUMSTRBUFS];
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static int nextstr;
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void Init_Cstring() { /* Preallocate memory to avoid fragmentation */
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int i;
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for (i = 0; i < NUMSTRBUFS; i++)
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heapstr[i] = Safe_Malloc (heaplen[i] = 512);
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}
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char *Get_String (Object str) {
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char **pp = &heapstr[nextstr];
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unsigned int len;
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Check_Type (str, T_String);
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len = STRING(str)->size + 1;
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if (len > heaplen[nextstr]) {
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Disable_Interrupts;
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*pp = Safe_Realloc (*pp, len);
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heaplen[nextstr] = len;
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Enable_Interrupts;
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}
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memcpy (*pp, STRING(str)->data, --len);
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(*pp)[len] = '\0';
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if (++nextstr == NUMSTRBUFS) nextstr = 0;
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return *pp;
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}
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char *Get_Strsym (Object str) {
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if (TYPE(str) == T_Symbol)
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str = SYMBOL(str)->name;
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else if (TYPE(str) != T_String)
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Wrong_Type_Combination (str, "string or symbol");
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return Get_String (str);
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}
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