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/* See LICENSE file for copyright and license details. */
#include "common.h"
int
patheq(const char *have, const char *want, const char **end_out)
{
while (*want) {
if (*have != *want)
return 0;
if (*have == '/') {
while (*++have == '/');
while (*++want == '/');
}
}
if (!end_out)
return !*have;
*end_out = have;
return 1;
}
int
openfile(const char *path, int *is_new_fd_out, const char **fname_out)
{
const char *p;
int fd, digit;
*fname_out = path;
if (patheq(path, "/dev/fd/", &p) || patheq(path, "/proc/self/fd/", &p)) {
fd = 0;
while (isdigit(*p)) {
digit = (int)(*p & 15);
if (fd > (INT_MAX - digit) / 10)
goto fallback;
fd = fd * 10 + digit;
}
if (*p)
goto fallback;
*is_new_fd_out = 0;
return 0;
} else if (!strcmp(path, "-")) {
*fname_out = "<stdin>";
*is_new_fd_out = 0;
return STDIN_FILENO;
} else if (patheq(path, "/dev/stdin", NULL)) {
*is_new_fd_out = 0;
return STDIN_FILENO;
} else if (patheq(path, "/dev/stdout", NULL)) {
*is_new_fd_out = 0;
return STDOUT_FILENO;
} else if (patheq(path, "/dev/stderr", NULL)) {
*is_new_fd_out = 0;
return STDERR_FILENO;
} else {
fallback:
fd = open(path, O_RDONLY);
if (fd < 0) {
weprintf("%s:", path);
return -1;
}
*is_new_fd_out = 0;
return fd;
}
}
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