![Humm](/assets/img/avatar_default.png)
Unmatched substrings are nil, so we can't rely on nil terminating the array of substrings.
456 lines
7.9 KiB
C
456 lines
7.9 KiB
C
#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include <regexp.h>
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#include <thread.h>
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#include <plumb.h>
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#include "plumber.h"
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int
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verbis(int obj, Plumbmsg *m, Rule *r)
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{
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switch(obj){
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default:
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fprint(2, "unimplemented 'is' object %d\n", obj);
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break;
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case OData:
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return strcmp(m->data, r->qarg) == 0;
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case ODst:
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return strcmp(m->dst, r->qarg) == 0;
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case OType:
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return strcmp(m->type, r->qarg) == 0;
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case OWdir:
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return strcmp(m->wdir, r->qarg) == 0;
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case OSrc:
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return strcmp(m->src, r->qarg) == 0;
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}
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return 0;
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}
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static void
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setvar(Resub rs[10], char *match[10])
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{
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int i, n;
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for(i=0; i<10; i++){
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free(match[i]);
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match[i] = nil;
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}
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for(i=0; i<10; i++)
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if(rs[i].sp!=nil){
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n = rs[i].ep-rs[i].sp;
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match[i] = emalloc(n+1);
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memmove(match[i], rs[i].sp, n);
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match[i][n] = '\0';
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}
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}
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int
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clickmatch(Reprog *re, char *text, Resub rs[10], int click)
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{
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char *clickp;
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int i;
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Rune r;
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/* click is in characters, not bytes */
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for(i=0, clickp=text; i<click && *clickp!='\0'; i++)
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clickp += chartorune(&r, clickp);
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for(i=0; i<=click; i++){
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memset(rs, 0, 10*sizeof(Resub));
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if(regexec(re, text+i, rs, 10))
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if(rs[0].sp<=clickp && clickp<=rs[0].ep)
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return 1;
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}
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return 0;
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}
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int
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verbmatches(int obj, Plumbmsg *m, Rule *r, Exec *e)
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{
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Resub rs[10];
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char *clickval, *alltext;
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int p0, p1, ntext;
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memset(rs, 0, sizeof rs);
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ntext = -1;
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switch(obj){
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default:
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fprint(2, "unimplemented 'matches' object %d\n", obj);
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break;
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case OData:
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clickval = plumblookup(m->attr, "click");
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if(clickval == nil){
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alltext = m->data;
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ntext = m->ndata;
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goto caseAlltext;
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}
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if(!clickmatch(r->regex, m->data, rs, atoi(clickval)))
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break;
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p0 = rs[0].sp - m->data;
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p1 = rs[0].ep - m->data;
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if(e->p0 >=0 && !(p0==e->p0 && p1==e->p1))
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break;
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e->clearclick = 1;
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e->setdata = 1;
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e->p0 = p0;
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e->p1 = p1;
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setvar(rs, e->match);
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return 1;
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case ODst:
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alltext = m->dst;
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goto caseAlltext;
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case OType:
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alltext = m->type;
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goto caseAlltext;
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case OWdir:
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alltext = m->wdir;
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goto caseAlltext;
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case OSrc:
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alltext = m->src;
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/* fall through */
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caseAlltext:
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/* must match full text */
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if(ntext < 0)
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ntext = strlen(alltext);
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if(!regexec(r->regex, alltext, rs, 10) || rs[0].sp!=alltext || rs[0].ep!=alltext+ntext)
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break;
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setvar(rs, e->match);
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return 1;
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}
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return 0;
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}
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int
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isfile(char *file, ulong maskon, ulong maskoff)
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{
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Dir *d;
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int mode;
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d = dirstat(file);
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if(d == nil)
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return 0;
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mode = d->mode;
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free(d);
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if((mode & maskon) == 0)
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return 0;
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if(mode & maskoff)
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return 0;
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return 1;
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}
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char*
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absolute(char *dir, char *file)
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{
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char *p;
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if(file[0] == '/')
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return estrdup(file);
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p = emalloc(strlen(dir)+1+strlen(file)+1);
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sprint(p, "%s/%s", dir, file);
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return cleanname(p);
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}
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int
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verbisfile(int obj, Plumbmsg *m, Rule *r, Exec *e, ulong maskon, ulong maskoff, char **var)
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{
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char *file;
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switch(obj){
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default:
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fprint(2, "unimplemented 'isfile' object %d\n", obj);
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break;
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case OArg:
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file = absolute(m->wdir, expand(e, r->arg, nil));
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if(isfile(file, maskon, maskoff)){
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*var = file;
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return 1;
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}
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free(file);
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break;
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case OData:
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case OWdir:
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file = absolute(m->wdir, obj==OData? m->data : m->wdir);
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if(isfile(file, maskon, maskoff)){
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*var = file;
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return 1;
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}
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free(file);
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break;
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}
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return 0;
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}
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int
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verbset(int obj, Plumbmsg *m, Rule *r, Exec *e)
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{
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char *new;
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switch(obj){
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default:
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fprint(2, "unimplemented 'is' object %d\n", obj);
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break;
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case OData:
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new = estrdup(expand(e, r->arg, nil));
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m->ndata = strlen(new);
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free(m->data);
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m->data = new;
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e->p0 = -1;
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e->p1 = -1;
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e->setdata = 0;
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return 1;
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case ODst:
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new = estrdup(expand(e, r->arg, nil));
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free(m->dst);
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m->dst = new;
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return 1;
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case OType:
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new = estrdup(expand(e, r->arg, nil));
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free(m->type);
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m->type = new;
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return 1;
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case OWdir:
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new = estrdup(expand(e, r->arg, nil));
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free(m->wdir);
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m->wdir = new;
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return 1;
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case OSrc:
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new = estrdup(expand(e, r->arg, nil));
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free(m->src);
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m->src = new;
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return 1;
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}
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return 0;
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}
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int
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verbadd(int obj, Plumbmsg *m, Rule *r, Exec *e)
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{
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switch(obj){
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default:
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fprint(2, "unimplemented 'add' object %d\n", obj);
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break;
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case OAttr:
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m->attr = plumbaddattr(m->attr, plumbunpackattr(expand(e, r->arg, nil)));
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return 1;
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}
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return 0;
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}
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int
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verbdelete(int obj, Plumbmsg *m, Rule *r, Exec *e)
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{
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char *a;
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switch(obj){
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default:
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fprint(2, "unimplemented 'delete' object %d\n", obj);
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break;
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case OAttr:
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a = expand(e, r->arg, nil);
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if(plumblookup(m->attr, a) == nil)
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break;
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m->attr = plumbdelattr(m->attr, a);
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return 1;
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}
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return 0;
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}
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int
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matchpat(Plumbmsg *m, Exec *e, Rule *r)
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{
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switch(r->verb){
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default:
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fprint(2, "unimplemented verb %d\n", r->verb);
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break;
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case VAdd:
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return verbadd(r->obj, m, r, e);
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case VDelete:
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return verbdelete(r->obj, m, r, e);
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case VIs:
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return verbis(r->obj, m, r);
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case VIsdir:
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return verbisfile(r->obj, m, r, e, DMDIR, 0, &e->dir);
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case VIsfile:
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return verbisfile(r->obj, m, r, e, ~DMDIR, DMDIR, &e->file);
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case VMatches:
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return verbmatches(r->obj, m, r, e);
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case VSet:
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verbset(r->obj, m, r, e);
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return 1;
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}
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return 0;
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}
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void
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freeexec(Exec *exec)
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{
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int i;
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if(exec == nil)
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return;
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free(exec->dir);
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free(exec->file);
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for(i=0; i<10; i++)
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free(exec->match[i]);
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free(exec);
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}
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Exec*
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newexec(Plumbmsg *m)
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{
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Exec *exec;
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exec = emalloc(sizeof(Exec));
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exec->msg = m;
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exec->p0 = -1;
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exec->p1 = -1;
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return exec;
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}
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void
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rewrite(Plumbmsg *m, Exec *e)
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{
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Plumbattr *a, *prev;
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if(e->clearclick){
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prev = nil;
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for(a=m->attr; a!=nil; a=a->next){
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if(strcmp(a->name, "click") == 0){
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if(prev == nil)
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m->attr = a->next;
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else
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prev->next = a->next;
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free(a->name);
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free(a->value);
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free(a);
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break;
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}
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prev = a;
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}
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if(e->setdata){
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free(m->data);
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m->data = estrdup(expand(e, "$0", nil));
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m->ndata = strlen(m->data);
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}
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}
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}
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char**
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buildargv(char *s, Exec *e)
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{
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char **av;
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int ac;
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ac = 0;
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av = nil;
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for(;;){
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av = erealloc(av, (ac+1) * sizeof(char*));
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av[ac] = nil;
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while(*s==' ' || *s=='\t')
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s++;
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if(*s == '\0')
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break;
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av[ac++] = estrdup(expand(e, s, &s));
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}
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return av;
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}
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Exec*
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matchruleset(Plumbmsg *m, Ruleset *rs)
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{
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int i;
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Exec *exec;
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if(m->dst!=nil && m->dst[0]!='\0' && rs->port!=nil && strcmp(m->dst, rs->port)!=0)
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return nil;
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exec = newexec(m);
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for(i=0; i<rs->npat; i++)
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if(!matchpat(m, exec, rs->pat[i])){
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freeexec(exec);
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return nil;
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}
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if(rs->port!=nil && (m->dst==nil || m->dst[0]=='\0')){
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free(m->dst);
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m->dst = estrdup(rs->port);
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}
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rewrite(m, exec);
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return exec;
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}
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enum
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{
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NARGS = 100,
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NARGCHAR = 8*1024,
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EXECSTACK = 4096+(NARGS+1)*sizeof(char*)+NARGCHAR
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};
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/* copy argv to stack and free the incoming strings, so we don't leak argument vectors */
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void
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stackargv(char **inargv, char *argv[NARGS+1], char args[NARGCHAR])
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{
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int i, n;
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char *s, *a;
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s = args;
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for(i=0; i<NARGS; i++){
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a = inargv[i];
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if(a == nil)
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break;
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n = strlen(a)+1;
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if((s-args)+n >= NARGCHAR) /* too many characters */
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break;
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argv[i] = s;
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memmove(s, a, n);
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s += n;
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free(a);
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}
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argv[i] = nil;
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}
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void
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execproc(void *v)
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{
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char **av;
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char buf[1024], *args[NARGS+1], argc[NARGCHAR];
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rfork(RFFDG);
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close(0);
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open("/dev/null", OREAD);
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av = v;
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stackargv(av, args, argc);
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free(av);
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procexec(nil, args[0], args);
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if(args[0][0]!='/' && strncmp(args[0], "./", 2)!=0 && strncmp(args[0], "../", 3)!=0)
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snprint(buf, sizeof buf, "/bin/%s", args[0]);
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procexec(nil, buf, args);
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threadexits("can't exec");
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}
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char*
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startup(Ruleset *rs, Exec *e)
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{
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char **argv;
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int i;
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if(rs != nil)
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for(i=0; i<rs->nact; i++){
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if(rs->act[i]->verb == VStart)
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goto Found;
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if(rs->act[i]->verb == VClient){
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if(e->msg->dst==nil || e->msg->dst[0]=='\0')
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return "no port for \"client\" rule";
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e->holdforclient = 1;
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goto Found;
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}
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}
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return "no start action for plumb message";
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Found:
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argv = buildargv(rs->act[i]->arg, e);
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if(argv[0] == nil)
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return "empty argument list";
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proccreate(execproc, argv, EXECSTACK);
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return nil;
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}
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