diff options
Diffstat (limited to 'src/cmd/sam/address.c')
| -rw-r--r-- | src/cmd/sam/address.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/src/cmd/sam/address.c b/src/cmd/sam/address.c new file mode 100644 index 00000000..85cca170 --- /dev/null +++ b/src/cmd/sam/address.c @@ -0,0 +1,240 @@ +#include "sam.h" +#include "parse.h" + +Address addr; +String lastpat; +int patset; +File *menu; + +File *matchfile(String*); +Address charaddr(Posn, Address, int); + +Address +address(Addr *ap, Address a, int sign) +{ + File *f = a.f; + Address a1, a2; + + do{ + switch(ap->type){ + case 'l': + case '#': + a = (*(ap->type=='#'?charaddr:lineaddr))(ap->num, a, sign); + break; + + case '.': + a = f->dot; + break; + + case '$': + a.r.p1 = a.r.p2 = f->_.nc; + break; + + case '\'': + a.r = f->mark; + break; + + case '?': + sign = -sign; + if(sign == 0) + sign = -1; + /* fall through */ + case '/': + nextmatch(f, ap->are, sign>=0? a.r.p2 : a.r.p1, sign); + a.r = sel.p[0]; + break; + + case '"': + a = matchfile(ap->are)->dot; + f = a.f; + if(f->unread) + load(f); + break; + + case '*': + a.r.p1 = 0, a.r.p2 = f->_.nc; + return a; + + case ',': + case ';': + if(ap->left) + a1 = address(ap->left, a, 0); + else + a1.f = a.f, a1.r.p1 = a1.r.p2 = 0; + if(ap->type == ';'){ + f = a1.f; + a = a1; + f->dot = a1; + } + if(ap->next) + a2 = address(ap->next, a, 0); + else + a2.f = a.f, a2.r.p1 = a2.r.p2 = f->_.nc; + if(a1.f != a2.f) + error(Eorder); + a.f = a1.f, a.r.p1 = a1.r.p1, a.r.p2 = a2.r.p2; + if(a.r.p2 < a.r.p1) + error(Eorder); + return a; + + case '+': + case '-': + sign = 1; + if(ap->type == '-') + sign = -1; + if(ap->next==0 || ap->next->type=='+' || ap->next->type=='-') + a = lineaddr(1L, a, sign); + break; + default: + panic("address"); + return a; + } + }while(ap = ap->next); /* assign = */ + return a; +} + +void +nextmatch(File *f, String *r, Posn p, int sign) +{ + compile(r); + if(sign >= 0){ + if(!execute(f, p, INFINITY)) + error(Esearch); + if(sel.p[0].p1==sel.p[0].p2 && sel.p[0].p1==p){ + if(++p>f->_.nc) + p = 0; + if(!execute(f, p, INFINITY)) + panic("address"); + } + }else{ + if(!bexecute(f, p)) + error(Esearch); + if(sel.p[0].p1==sel.p[0].p2 && sel.p[0].p2==p){ + if(--p<0) + p = f->_.nc; + if(!bexecute(f, p)) + panic("address"); + } + } +} + +File * +matchfile(String *r) +{ + File *f; + File *match = 0; + int i; + + for(i = 0; i<file.nused; i++){ + f = file.filepptr[i]; + if(f == cmd) + continue; + if(filematch(f, r)){ + if(match) + error(Emanyfiles); + match = f; + } + } + if(!match) + error(Efsearch); + return match; +} + +int +filematch(File *f, String *r) +{ + char *c, buf[STRSIZE+100]; + String *t; + + c = Strtoc(&f->name); + sprint(buf, "%c%c%c %s\n", " '"[f->mod], + "-+"[f->rasp!=0], " ."[f==curfile], c); + free(c); + t = tmpcstr(buf); + Strduplstr(&genstr, t); + freetmpstr(t); + /* A little dirty... */ + if(menu == 0) + menu = fileopen(); + bufreset(menu); + bufinsert(menu, 0, genstr.s, genstr.n); + compile(r); + return execute(menu, 0, menu->_.nc); +} + +Address +charaddr(Posn l, Address addr, int sign) +{ + if(sign == 0) + addr.r.p1 = addr.r.p2 = l; + else if(sign < 0) + addr.r.p2 = addr.r.p1-=l; + else if(sign > 0) + addr.r.p1 = addr.r.p2+=l; + if(addr.r.p1<0 || addr.r.p2>addr.f->_.nc) + error(Erange); + return addr; +} + +Address +lineaddr(Posn l, Address addr, int sign) +{ + int n; + int c; + File *f = addr.f; + Address a; + Posn p; + + a.f = f; + if(sign >= 0){ + if(l == 0){ + if(sign==0 || addr.r.p2==0){ + a.r.p1 = a.r.p2 = 0; + return a; + } + a.r.p1 = addr.r.p2; + p = addr.r.p2-1; + }else{ + if(sign==0 || addr.r.p2==0){ + p = (Posn)0; + n = 1; + }else{ + p = addr.r.p2-1; + n = filereadc(f, p++)=='\n'; + } + while(n < l){ + if(p >= f->_.nc) + error(Erange); + if(filereadc(f, p++) == '\n') + n++; + } + a.r.p1 = p; + } + while(p < f->_.nc && filereadc(f, p++)!='\n') + ; + a.r.p2 = p; + }else{ + p = addr.r.p1; + if(l == 0) + a.r.p2 = addr.r.p1; + else{ + for(n = 0; n<l; ){ /* always runs once */ + if(p == 0){ + if(++n != l) + error(Erange); + }else{ + c = filereadc(f, p-1); + if(c != '\n' || ++n != l) + p--; + } + } + a.r.p2 = p; + if(p > 0) + p--; + } + while(p > 0 && filereadc(f, p-1)!='\n') /* lines start after a newline */ + p--; + a.r.p1 = p; + } + return a; +} |