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| Rev | Author | Line No. | Line |
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| 10 | reyssat | 1 | /* Copyright (C) 1998-2003 XIAO, Gang of Universite de Nice - Sophia Antipolis |
| 2 | * |
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| 3 | * This program is free software; you can redistribute it and/or modify |
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| 4 | * it under the terms of the GNU General Public License as published by |
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| 5 | * the Free Software Foundation; either version 2 of the License, or |
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| 6 | * (at your option) any later version. |
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| 7 | * |
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| 8 | * This program is distributed in the hope that it will be useful, |
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| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 11 | * GNU General Public License for more details. |
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| 12 | * |
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| 13 | * You should have received a copy of the GNU General Public License |
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| 14 | * along with this program; if not, write to the Free Software |
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| 15 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 16 | */ |
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| 17 | |||
| 18 | /* Subroutines to manipulate math expressions */ |
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| 19 | |||
| 20 | |||
| 21 | /* Points to the start of a mathematics variable (or number) */ |
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| 22 | char *find_mathvar_start(char *p) |
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| 23 | { |
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| 24 | int i; |
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| 25 | for(i=0;!isalnum(*p) && *p!='.' && *p!=0 && i<MAX_LINELEN; p++,i++); |
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| 26 | return p; |
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| 27 | } |
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| 28 | |||
| 29 | /* Points to the end of a mathematics variable (or number) */ |
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| 30 | char *find_mathvar_end(char *p) |
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| 31 | { |
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| 32 | int i; char *pp; |
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| 33 | if(!isalnum(*p) && *p!='.') return p; |
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| 34 | if(isalpha(*p)) { |
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| 35 | for(i=0; *p!=0 && (isalnum(*p) || *p=='.' || *p=='\'') |
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| 36 | && i<MAX_LINELEN;p++,i++); |
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| 37 | return p; |
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| 38 | } |
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| 39 | else { |
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| 40 | int t=0; |
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| 41 | expon: |
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| 42 | for(i=0; (isdigit(*p) || *p=='.') && i<MAX_LINELEN;p++,i++); |
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| 43 | pp=p; if(t) return pp; |
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| 44 | while(isspace(*p)) p++; |
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| 45 | if(*p=='e' || *p=='E'){ |
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| 46 | t=1; p++; while(isspace(*p)) p++; |
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| 47 | if(isdigit(*p)) goto expon; |
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| 48 | if((*p=='-' || *p=='+') && isdigit(*(p+1))) { |
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| 49 | p++; goto expon; |
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| 50 | } |
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| 51 | } |
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| 52 | return pp; |
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| 53 | } |
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| 54 | } |
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| 55 | |||
| 56 | /* list variable (function) names in an expression. |
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| 57 | * buffer is modified to contain the list. */ |
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| 58 | void mathvarlist(char *p) |
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| 59 | { |
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| 60 | char buf[MAX_LINELEN+1], *pb, *pe, *pp; |
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| 61 | char *l[10240]; |
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| 62 | int i,j,len, nofn=0; |
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| 63 | |||
| 64 | pb=find_word_start(p);pe=find_word_end(pb); |
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| 65 | if(pe-pb==strlen("nofn") && memcmp(pb,"nofn",strlen("nofn"))==0) { |
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| 66 | nofn=1; pb=find_word_start(pe); |
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| 67 | } |
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| 68 | snprintf(buf,sizeof(buf),"%s",pb); |
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| 69 | len=strlen(buf); |
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| 70 | for(i=0,pb=buf;pb<buf+len;pb++) { |
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| 71 | if(!isalpha(*pb)) continue; |
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| 72 | if(pb>buf && isalnum(*(pb-1))) { |
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| 73 | pb=find_mathvar_end(pb); continue; |
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| 74 | } |
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| 75 | pe=find_mathvar_end(pb); pp=find_word_start(pe); |
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| 76 | if(nofn && *pp=='(') { |
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| 77 | pb=pe; continue; |
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| 78 | } |
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| 79 | *pe=0; |
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| 80 | if(i<10240) { |
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| 81 | for(j=0;j<i;j++) if(strcmp(pb,l[j])==0) goto nextp; |
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| 82 | l[i++]=pb; |
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| 83 | } |
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| 84 | nextp: |
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| 85 | pb=pe; |
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| 86 | } |
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| 87 | for(*p=0,j=0;j<i;j++) { |
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| 88 | strcat(p,l[j]); |
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| 89 | if(j<i-1) strcat(p,","); |
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| 90 | } |
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| 91 | } |
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| 92 |