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author | Mystery Man <unknown@mandriva.org> | 2003-02-17 13:58:09 +0000 |
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committer | Mystery Man <unknown@mandriva.org> | 2003-02-17 13:58:09 +0000 |
commit | 0dba959cedf1129579809c769929713e3ad93099 (patch) | |
tree | 36721d86f80dddd9ac452269a0eb0f5d2159328c /mdk-stage1/dietlibc/libregex | |
parent | a5d6fe3636f8080b9603572894ed317aaed6d2c8 (diff) | |
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This commit was manufactured by cvs2svn to create tag 'V9_1_0_34mdk'.V9_1_0_34mdk
Diffstat (limited to 'mdk-stage1/dietlibc/libregex')
-rw-r--r-- | mdk-stage1/dietlibc/libregex/rx.c | 434 |
1 files changed, 0 insertions, 434 deletions
diff --git a/mdk-stage1/dietlibc/libregex/rx.c b/mdk-stage1/dietlibc/libregex/rx.c deleted file mode 100644 index b28358c2e..000000000 --- a/mdk-stage1/dietlibc/libregex/rx.c +++ /dev/null @@ -1,434 +0,0 @@ -#include <regex.h> -#include <stdlib.h> -#include <ctype.h> -#include <sys/types.h> -#include <string.h> - -/* this is ugly. - * the idea is to build a parse tree, then do some poor man's OOP with a - * generic matcher function call that is always that the start of each - * record, and a next pointer. When the parse tree is done, we need to - * recursively set the next pointers to point to the part of the parse - * tree that needs to match next. - * This is the prototype of the generic match function call pointer. - * The first argument is the "this" pointer, the second is the text to - * be matched against, ofs is the offset from the start of the matched - * text (so we can match "^") and matches is an array where match - * positions are stored. */ -/* now declared in regex.h: */ -/* typedef int (*matcher)(void*,const char*,int ofs,regmatch_t* matches,int plus,int eflags); */ - -/* one would think that this is approach is an order of magnitude slower - * than the standard NFA approach, but it isn't. The busybox grep took - * 0.26 seconds for a fixed string compared to 0.19 seconds for the - * glibc regex. */ - -/* first part: parse a regex into a parse tree */ -struct bracketed { - unsigned int cc[32]; -}; - -/* now declared in regex.h: -struct regex { - matcher m; - void* next; - int pieces; - int num; - struct branch *b; -}; */ - -struct atom { - matcher m; - void* next; - enum { EMPTY, REGEX, BRACKET, ANY, LINESTART, LINEEND, WORDSTART, WORDEND, CHAR, } type; - int bnum; - union { - struct regex r; - struct bracketed b; - char c; - } u; -}; - -struct piece { - matcher m; - void* next; - struct atom a; - unsigned char min,max; -}; - -struct branch { - matcher m; - void* next; - int num; - struct piece *p; -}; - -static void clearcc(unsigned int* x) { - memset(x,0,sizeof(*x)); -} - -static void setcc(unsigned int* x,unsigned int bit) { - x[bit/32]|=(1<<((bit%32)-1)); -} - -static int issetcc(unsigned int* x,unsigned int bit) { - return x[bit/32] & (1<<((bit%32)-1)); -} - -static const char* parsebracketed(struct bracketed*__restrict__ b,const char*__restrict__ s,regex_t*__restrict__ rx) { - const char* t; - int i,negflag=0; - if (*s!='[') return s; - t=s+1; - clearcc(b->cc); - if (*t=='^') { negflag=1; ++t; } - do { - if (*t==0) return s; - setcc(b->cc,rx->cflags®_ICASE?*t:tolower(*t)); - if (t[1]=='-' && t[2]!=']') { - for (i=*t+1; i<=t[2]; ++i) setcc(b->cc,rx->cflags®_ICASE?i:tolower(i)); - t+=2; - } - ++t; - } while (*t!=']'); - if (negflag) for (i=0; i<32; ++i) b->cc[i]=~b->cc[i]; - return t+1; -} - -static const char* parseregex(struct regex* r,const char* s,regex_t* rx); - -static int matchatom(void*__restrict__ x,const char*__restrict__ s,int ofs,struct __regex_t*__restrict__ preg,int plus,int eflags) { - register struct atom* a=(struct atom*)x; - int matchlen=0; - switch (a->type) { - case EMPTY: -// printf("matching EMPTY against \"%s\"\n",s); - preg->l[a->bnum].rm_so=preg->l[a->bnum].rm_eo=ofs; - goto match; - case REGEX: -// printf("matching REGEX against \"%s\"\n",s); - if ((matchlen=a->u.r.m(a,s,ofs,preg,0,eflags))>=0) { - preg->l[a->bnum].rm_so=ofs; - preg->l[a->bnum].rm_eo=ofs+matchlen; - goto match; - } - break; - case BRACKET: -// printf("matching BRACKET against \"%s\"\n",s); - matchlen=1; - if (*s=='\n' && (preg->cflags®_NEWLINE)) break; - if (*s && issetcc(a->u.b.cc,(preg->cflags®_ICASE?tolower(*s):*s))) - goto match; - break; - case ANY: -// printf("matching ANY against \"%s\"\n",s); - if (*s=='\n' && (preg->cflags®_NEWLINE)) break; - matchlen=1; - if (*s) goto match; - break; - case LINESTART: -// printf("matching LINESTART against \"%s\"\n",s); - if (ofs==0 && (eflags®_NOTBOL)==0) { - goto match; - } - break; - case LINEEND: -// printf("matching LINEEND against \"%s\"\n",s); - if ((*s && *s!='\n') || (eflags®_NOTEOL)==0) break; - goto match; - case WORDSTART: - if ((ofs==0 || isspace(s[-1])) && !isspace(*s)) - goto match; - break; - case WORDEND: - if (ofs>0 && !isspace(s[-1]) && isspace(*s)) - goto match; - break; - case CHAR: -// printf("matching CHAR %c against \"%s\"\n",a->u.c,s); - matchlen=1; - if (((preg->cflags®_ICASE)?tolower(*s):*s)==a->u.c) goto match; - break; - } - return -1; -match: - if (a->next) - return ((struct atom*)(a->next))->m(a->next,s+matchlen,ofs+matchlen,preg,plus+matchlen,eflags); - else - return plus+matchlen; -} - -static const char* parseatom(struct atom*__restrict__ a,const char*__restrict__ s,regex_t*__restrict__ rx) { - const char *tmp; - a->m=matchatom; - a->bnum=-1; - switch (*s) { - case '(': - a->bnum=++rx->brackets; - if (s[1]==')') { - a->type=EMPTY; - return s+2; - } - a->type=REGEX; - if ((tmp=parseregex(&a->u.r,s+1,rx))!=s) { - if (*tmp==')') - return tmp+1; - } - case 0: - case '|': - case ')': - return s; - case '[': - a->type=BRACKET; - if ((tmp=parsebracketed(&a->u.b,s,rx))!=s) - return tmp; - return s; - case '.': - a->type=ANY; - break; - case '^': - a->type=LINESTART; - break; - case '$': - a->type=LINEEND; - break; - case '\\': - if (!*++s) return s; - if (*s=='<') { - a->type=WORDSTART; - break; - } else if (*s=='>') { - a->type=WORDEND; - break; - } - default: - a->type=CHAR; - a->u.c=rx->cflags®_ICASE?*s:tolower(*s); - break; - } - return s+1; -} - -/* needs to do "greedy" matching, i.e. match as often as possible */ -static int matchpiece(void*__restrict__ x,const char*__restrict__ s,int ofs,struct __regex_t*__restrict__ preg,int plus,int eflags) { - register struct piece* a=(struct piece*)x; - int matchlen=0; - int tmp,num=0; - unsigned int *offsets=alloca(sizeof(int)*a->max); - offsets[0]=0; -// printf("matchpiece \"%s\"...\n",s); - /* first, try to match the atom as often as possible, up to a->max times */ - if (a->max == 1 && a->min == 1) - return a->a.m(&a->a,s+matchlen,ofs+matchlen,preg,0,eflags); - while (num<a->max) { - void* save=a->a.next; - a->a.next=0; - if ((tmp=a->a.m(&a->a,s+matchlen,ofs+matchlen,preg,0,eflags))>=0) { - a->a.next=save; - ++num; - matchlen+=tmp; - offsets[num]=tmp; - } else { - a->a.next=save; - break; - } - } - if (num<a->min) return -1; /* already at minimum matches; signal mismatch */ - /* then, while the rest does not match, back off */ - for (;;) { - if (a->next) - tmp=((struct atom*)(a->next))->m(a->next,s+matchlen,ofs+matchlen,preg,plus+matchlen,eflags); - else - tmp=plus+matchlen; - if (tmp>=0) break; /* it did match; don't back off any further */ - matchlen-=offsets[num]; - --num; - } - return tmp; -} - -static const char* parsepiece(struct piece*__restrict__ p,const char*__restrict__ s,regex_t*__restrict__ rx) { - const char* tmp=parseatom(&p->a,s,rx); - if (tmp==s) return s; - p->m=matchpiece; - p->min=p->max=1; - switch (*tmp) { - case '*': p->min=0; p->max=RE_DUP_MAX; break; - case '+': p->min=1; p->max=RE_DUP_MAX; break; - case '?': p->min=0; p->max=1; break; - case '{': - if (isdigit(*++tmp)) { - p->min=*tmp-'0'; p->max=RE_DUP_MAX; - while (isdigit(*++tmp)) p->min=p->min*10+*tmp-'0'; - if (*tmp==',') { - if (isdigit(*++tmp)) { - p->max=*tmp-'0'; - while (isdigit(*++tmp)) p->max=p->max*10+*tmp-'0'; - } - } - if (*tmp!='}') return s; - ++tmp; - } - default: - return tmp; - } - return tmp+1; -} - -/* trivial, just pass through */ -static int matchbranch(void*__restrict__ x,const char*__restrict__ s,int ofs,struct __regex_t*__restrict__ preg,int plus,int eflags) { - register struct branch* a=(struct branch*)x; - int tmp; - tmp=a->p->m(a->p,s,ofs,preg,plus,eflags); - if (tmp>=0) { - if (a->next) - return ((struct atom*)(a->next))->m(a->next,s+tmp,ofs+tmp,preg,plus+tmp,eflags); - else - return plus+tmp; - } - return -1; -} - -static const char* parsebranch(struct branch*__restrict__ b,const char*__restrict__ s,regex_t*__restrict__ rx,int*__restrict__ pieces) { - struct piece p; - const char *tmp; - b->m=matchbranch; - b->num=0; b->p=0; - for (;;) { - if (*s=='|') { - if (b->num==0) { - tmp=s+1; - p.a.type=EMPTY; - p.min=p.max=1; - } - } else { - tmp=parsepiece(&p,s,rx); - if (tmp==s) return s; - } - if (!(b->p=realloc(b->p,++b->num*sizeof(p)))) return s; - b->p[b->num-1]=p; - if (*s=='|') { ++tmp; break; } - s=tmp; - } - *pieces+=b->num; - return tmp; -} - -/* try the branches one by one */ -static int matchregex(void*__restrict__ x,const char*__restrict__ s,int ofs,struct __regex_t*__restrict__ preg,int plus,int eflags) { - register struct regex* a=(struct regex*)x; - int i,tmp; - for (i=0; i<a->num; ++i) { - tmp=a->b[i].m(&a->b[i],s,ofs,preg,plus,eflags); - if (tmp>=0) { - if (a->next) - return ((struct atom*)(a->next))->m(a->next,s+tmp,ofs+tmp,preg,plus+tmp,eflags); - else - return plus+tmp; - } - } - return -1; -} - -static const char* parseregex(struct regex*__restrict__ r,const char*__restrict__ s,regex_t*__restrict__ p) { - struct branch b; - const char *tmp; - r->m=matchregex; - r->num=0; r->b=0; r->pieces=0; - for (;;) { - tmp=parsebranch(&b,s,p,&r->pieces); - if (tmp==s) return s; - if (!(r->b=realloc(r->b,++r->num*sizeof(b)))) return s; - r->b[r->num-1]=b; - s=tmp; - } - return tmp; -} - - -/* The matcher relies on the presence of next pointers, of which the - * parser does not know the correct destination. So we need an - * additional pass through the data structure that sets the next - * pointers correctly. */ -static void regex_putnext(struct regex* r,void* next); - -static void atom_putnext(struct atom*__restrict__ a,void*__restrict__ next) { - a->next=next; - if (a->type==REGEX) - regex_putnext(&a->u.r,next); -} - -static void piece_putnext(struct piece*__restrict__ p,void*__restrict__ next) { - p->next=next; - atom_putnext(&p->a,next); -} - -static void branch_putnext(struct branch*__restrict__ b,void*__restrict__ next) { - int i; - for (i=0; i<b->num-1; ++i) - piece_putnext(&b->p[i],&b->p[i+1]); - piece_putnext(&b->p[i],0); - b->next=next; -} - -static void regex_putnext(struct regex*__restrict__ r,void*__restrict__ next) { - int i; - for (i=0; i<r->num; ++i) - branch_putnext(&r->b[i],next); - r->next=next; -} - - - -int regcomp(regex_t*__restrict__ preg, const char*__restrict__ regex, int cflags) { - const char* t=parseregex(&preg->r,regex,preg); - if (t==regex) return -1; - regex_putnext(&preg->r,0); - preg->cflags=cflags; - return 0; -} - -int regexec(const regex_t*__restrict__ preg, const char*__restrict__ string, size_t nmatch, regmatch_t pmatch[], int eflags) { - int matched; - const char *orig=string; - ((regex_t*)preg)->l=alloca(sizeof(regmatch_t)*(preg->brackets+1)); - while (*string) { - matched=preg->r.m((void*)&preg->r,string,string-orig,(regex_t*)preg,0,eflags); - if (matched>=0) { - if ((preg->cflags®_NOSUB)==0) memmove(pmatch,preg->l,nmatch*sizeof(regmatch_t)); - return 0; - } - ++string; eflags|=REG_NOTBOL; - } - return REG_NOMATCH; -} - - - -void regfree(regex_t* preg) { - int i; - for (i=0; i<preg->r.num; ++i) { - free(preg->r.b[i].p); - free(preg->r.b); - } -} - -size_t regerror(int errcode, const regex_t*__restrict__ preg, char*__restrict__ errbuf, size_t errbuf_size) { - strncpy(errbuf,"invalid regular expression (sorry)",errbuf_size); - return strlen(errbuf); -} - - - - -#if 0 -int main() { - struct regex r; - int bnum=-1; - const char* t=parseregex(&r,"^a*ab$",&bnum); - regex_putnext(&r,0); - printf("%d pieces, %s\n",r.pieces,t); - printf("%d\n",r.m(&r,"aaab",0,0,0)); - return 0; -} -#endif |