/* Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 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, 59 Temple Place, Suite 330, Boston, MA 02111, USA. * * As a special exception, the Free Software Foundation gives permission * for additional uses of the text contained in its release of SCM. * * The exception is that, if you link the SCM 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 SCM 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 SCM. If you copy * code from other Free Software Foundation releases into a copy of * SCM, 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 SCM, it is your choice * whether to permit this exception to apply to your modifications. * If you do not wish that, delete this exception notice. */ /* "sc2.c" R2RS and R3RS procedures not in R4RS. Author: Aubrey Jaffer */ #include "scm.h" static char s_last_pair[] = "last-pair"; SCM last_pair(sx) SCM sx; { register SCM res = sx; register SCM x; ASRTER(NIMP(res) && CONSP(res), res, ARG1, s_last_pair); while (!0) { x = CDR(res); if (IMP(x) || NCONSP(x)) return res; res = x; x = CDR(res); if (IMP(x) || NCONSP(x)) return res; res = x; sx = CDR(sx); ASRTER(x != sx, sx, ARG1, s_last_pair); } } static char s_subml[] = "substring-move-left!"; SCM subml(str1, start1, args) SCM str1, start1, args; { SCM end1, str2, start2; long i, j, e; ASRTER(3==ilength(args), args, WNA, s_subml); end1 = CAR(args); args = CDR(args); str2 = CAR(args); args = CDR(args); start2 = CAR(args); ASRTER(NIMP(str1) && STRINGP(str1), str1, ARG1, s_subml); ASRTER(INUMP(start1), start1, ARG2, s_subml); ASRTER(INUMP(end1), end1, ARG3, s_subml); ASRTER(NIMP(str2) && STRINGP(str2), str2, ARG4, s_subml); ASRTER(INUMP(start2), start2, ARG5, s_subml); i = INUM(start1), j = INUM(start2), e = INUM(end1); ASRTER(i <= LENGTH(str1) && i >= 0, start1, OUTOFRANGE, s_subml); ASRTER(j <= LENGTH(str2) && j >= 0, start2, OUTOFRANGE, s_subml); ASRTER(e <= LENGTH(str1) && e >= 0, end1, OUTOFRANGE, s_subml); ASRTER(e-i+j <= LENGTH(str2), start2, OUTOFRANGE, s_subml); while(i<e) CHARS(str2)[j++] = CHARS(str1)[i++]; return UNSPECIFIED; } static char s_submr[] = "substring-move-right!"; SCM submr(str1, start1, args) SCM str1, start1, args; { SCM end1, str2, start2; long i, j, e; ASRTER(3==ilength(args), args, WNA, s_submr); end1 = CAR(args); args = CDR(args); str2 = CAR(args); args = CDR(args); start2 = CAR(args); ASRTER(NIMP(str1) && STRINGP(str1), str1, ARG1, s_submr); ASRTER(INUMP(start1), start1, ARG2, s_submr); ASRTER(INUMP(end1), end1, ARG3, s_submr); ASRTER(NIMP(str2) && STRINGP(str2), str2, ARG4, s_submr); ASRTER(INUMP(start2), start2, ARG5, s_submr); i = INUM(start1), j = INUM(start2), e = INUM(end1); ASRTER(i <= LENGTH(str1) && i >= 0, start1, OUTOFRANGE, s_submr); ASRTER(j <= LENGTH(str2) && j >= 0, start2, OUTOFRANGE, s_submr); ASRTER(e <= LENGTH(str1) && e >= 0, end1, OUTOFRANGE, s_submr); ASRTER((j = e-i+j) <= LENGTH(str2), start2, OUTOFRANGE, s_submr); while(i<e) CHARS(str2)[--j] = CHARS(str1)[--e]; return UNSPECIFIED; } static char s_subfl[] = "substring-fill!"; SCM subfl(str, start, args) SCM str, start, args; { SCM end, fill; long i, e; char c; ASRTER(2==ilength(args), args, WNA, s_subfl); end = CAR(args); args = CDR(args); fill = CAR(args); ASRTER(NIMP(str) && STRINGP(str), str, ARG1, s_subfl); ASRTER(INUMP(start), start, ARG2, s_subfl); ASRTER(INUMP(end), end, ARG3, s_subfl); ASRTER(ICHRP(fill), fill, ARG4, s_subfl); i = INUM(start), e = INUM(end);c = ICHR(fill); ASRTER(i <= LENGTH(str) && i >= 0, start, OUTOFRANGE, s_subfl); ASRTER(e <= LENGTH(str) && e >= 0, end, OUTOFRANGE, s_subfl); while(i<e) CHARS(str)[i++] = c; return UNSPECIFIED; } static char s_strnullp[] = "string-null?"; SCM strnullp(str) SCM str; { ASRTER(NIMP(str) && STRINGP(str), str, ARG1, s_strnullp); if (LENGTH(str)) return BOOL_F; else return BOOL_T; } static char s_appendb[] = "append!"; SCM appendb(args) SCM args; { SCM arg; tail: if (NULLP(args)) return EOL; arg = CAR(args); args = CDR(args); if (NULLP(args)) return arg; if (NULLP(arg)) goto tail; ASRTER(NIMP(arg) && CONSP(arg), arg, ARG1, s_appendb); CDR(last_pair(arg)) = appendb(args); return arg; } static iproc lsubr2s[] = { {s_subml, subml}, {s_submr, submr}, {s_subfl, subfl}, {0, 0}}; SCM_DLL_EXPORT void init_sc2 P((void)); void init_sc2() { make_subr(s_last_pair, tc7_subr_1, last_pair); make_subr(s_strnullp, tc7_subr_1, strnullp); make_subr(s_appendb, tc7_lsubr, appendb); init_iprocs(lsubr2s, tc7_lsubr_2); add_feature("rev2-procedures"); add_feature("rev3-procedures"); }