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Enable the spawn workhorse function to spawn shell scripts.

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For this purpose the path lookup is done manually, and the found file
is inspected for the interpreter. If one is found, the script is spawned
under the interpreter; otherwise, the program is spawned normally.
This commit is contained in:
Johannes Sixt
2007-01-12 10:10:25 +01:00
parent 09653a29cf
commit 23960ed3c3
1 changed files with 62 additions and 3 deletions
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65
spawn-pipe.c
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@@ -3,6 +3,53 @@
extern char **environ;
#ifdef __MINGW32__
static char *lookup_prog(const char *dir, const char *cmd, int tryexe)
{
char path[MAX_PATH];
snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
if (tryexe && access(path, 0) == 0)
return xstrdup(path);
path[strlen(path)-4] = '\0';
if (access(path, 0) == 0)
return xstrdup(path);
return NULL;
}
/*
* Determines the absolute path of cmd based on the PATH environment variable.
* If cmd contains a slash or backslash, no lookup is performed.
*/
static char *path_lookup(const char *cmd)
{
char *p, *envpath = getenv("PATH");
char *prog = NULL;
int len = strlen(cmd);
int tryexe = len < 4 || strcasecmp(cmd+len-4, ".exe");
if (strchr(cmd, '/') || strchr(cmd, '\\') ||
!envpath || !*envpath)
envpath = "";
envpath = xstrdup(envpath);
p = envpath;
while (p && !prog) {
const char *dir = p;
p = strchr(p, ';');
if (p) *p++ = '\0';
if (*dir)
prog = lookup_prog(dir, cmd, tryexe);
}
free(envpath);
if (!prog) {
prog = lookup_prog(".", cmd, tryexe);
if (!prog)
prog = xstrdup(cmd);
}
return prog;
}
#endif
/* cmd specifies the command to invoke.
* argv specifies its arguments; argv[0] will be replaced by the basename of cmd.
* env specifies the environment.
@@ -21,7 +68,8 @@ int spawnvpe_pipe(const char *cmd, const char **argv, const char **env,
#ifdef __MINGW32__
int s0 = -1, s1 = -1, argc;
const char **qargv;
char *prog;
const char **qargv, *interpr;
if (!cmd_basename)
cmd_basename = strrchr(cmd, '\\');
@@ -79,15 +127,26 @@ int spawnvpe_pipe(const char *cmd, const char **argv, const char **env,
}
}
prog = path_lookup(cmd);
interpr = parse_interpreter(prog);
for (argc = 0; argv[argc];) argc++;
qargv = xmalloc((argc+2)*sizeof(char*));
quote_argv(qargv, argv);
if (!interpr) {
quote_argv(qargv, argv);
pid = spawnve(_P_NOWAIT, prog, qargv, env);
} else {
qargv[0] = interpr;
argv[0] = prog;
quote_argv(&qargv[1], argv);
pid = spawnvpe(_P_NOWAIT, interpr, qargv, env);
}
pid = spawnvpe(_P_NOWAIT, cmd, qargv, env);
if (pid < 0)
die("unable to run %s", cmd);
free(qargv); /* TODO: quoted args should be freed, too */
free(prog);
if (s0 >= 0) {
dup2(s0, 0);