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|
use "alloc"
use "env"
use "errno"
use "option"
use "strfind"
use "syswrap"
use "slcp"
pkg std =
const execvp : (cmd : byte[:], args : byte[:][:] -> errno)
const execvpe : (cmd : byte[:], args : byte[:][:], env : byte[:][:] -> errno)
;;
const execvp = {cmd, args
var i, j, paths, binpath
var buf : byte[512]
match strfind(cmd, "/")
| `Some _:
-> execv(cmd, args)
| `None:
i = 0
j = 0
paths = std.getenvv("PATH", "/usr/local/bin:/bin:/usr/bin")
while j < paths.len
(i, j) = nextpath(paths, j)
binpath = mkpath(buf[:], paths[i:j], cmd)
execv(binpath, args)
;;
;;
-> -1
}
const execvpe = {cmd, args, env
var i, j, paths, binpath
var buf : byte[512]
match strfind(cmd, "/")
| `Some _:
-> execve(cmd, args, env)
| `None:
i = 0
j = 0
paths = std.getenvv("PATH", "/usr/local/bin:/bin:/usr/bin")
while j < paths.len
(i, j) = nextpath(paths, j)
binpath = mkpath(buf[:], paths[i:j], cmd)
execve(binpath, args, env)
;;
;;
-> -1
}
const nextpath = {p, start
var i, j
i = start
while i < p.len && p[i] == (':' : byte)
i++
;;
j = i
while j < p.len && p[j] != (':' : byte)
j++
;;
-> (i, j)
}
const mkpath = {buf, path, bin
var p, b
p = path.len
b = bin.len
if buf.len < p + b + 1
-> ""
;;
std.slcp(buf[:p], path)
std.slcp(buf[p:p + 1], "/")
std.slcp(buf[p + 1:p + b + 1], bin)
-> buf[:p + b + 1]
}
|
