#include <u.h>#include <libc.h> /* * Search $PATH for an executable with the given name. * Like in rc, mid-name slashes do not disable search. * Should probably handle escaped colons, * but I don't know what the syntax is. */char*searchpath(char *name){ char *path, *p, *next; char *s, *ss; int ns, l; s = nil; ns = 0; if((name[0] == '.' && name[1] == '/') || (name[0] == '.' && name[1] == '.' && name[2] == '/') || (name[0] == '/')){ if(access(name, AEXEC) >= 0) return strdup(name); return nil; } path = getenv("PATH"); for(p=path; p && *p; p=next){ if((next = strchr(p, ':')) != nil) *next++ = 0; if(*p == 0){ if(access(name, AEXEC) >= 0){ free(s); free(path); return strdup(name); } }else{ l = strlen(p)+1+strlen(name)+1; if(l > ns){ ss = realloc(s, l); if(ss == nil){ free(s); free(path); return nil; } s = ss; ns = l; } strcpy(s, p); strcat(s, "/"); strcat(s, name); if(access(s, AEXEC) >= 0){ free(path); return s; } } } free(s); free(path); return nil;}
#include <u.h>
#include <libc.h>
/*
* Search $PATH for an executable with the given name.
* Like in rc, mid-name slashes do not disable search.
* Should probably handle escaped colons,
* but I don't know what the syntax is.
*/
char*
searchpath(char *name)
{
char *path, *p, *next;
char *s, *ss;
int ns, l;
s = nil;
ns = 0;
if((name[0] == '.' && name[1] == '/')
|| (name[0] == '.' && name[1] == '.' && name[2] == '/')
|| (name[0] == '/')){
if(access(name, AEXEC) >= 0)
return strdup(name);
return nil;
}
path = getenv("PATH");
for(p=path; p && *p; p=next){
if((next = strchr(p, ':')) != nil)
*next++ = 0;
if(*p == 0){
if(access(name, AEXEC) >= 0){
free(s);
free(path);
return strdup(name);
}
}else{
l = strlen(p)+1+strlen(name)+1;
if(l > ns){
ss = realloc(s, l);
if(ss == nil){
free(s);
free(path);
return nil;
}
s = ss;
ns = l;
}
strcpy(s, p);
strcat(s, "/");
strcat(s, name);
if(access(s, AEXEC) >= 0){
free(path);
return s;
}
}
}
free(s);
free(path);
return nil;
}