1 files changed, 63 insertions, 0 deletions
diff --git a/lib/file.c b/lib/file.c
new file mode 100644
index 0000000..f89b489
--- /dev/null
+++ b/lib/file.c
@@ -0,0 +1,63 @@
+#include "file.h"
+#include "error.h"
+#include "convert.h"
+
+#include <paths.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+FILE* get_file_s(const char* path, const char* type) {
+    struct stat s;
+    FILE* file;
+
+    if (streql("-", path) && type[0] == 'r') {
+        clearerr(stdin);
+        fflush(stdin);
+        return stdin;
+    }
+    
+    if (lstat(path, &s) < 0) {
+        if (type[0] != 'r') goto read;
+        error_s("failed to read %s: %s", path, strerror(errno));
+        return NULL;
+    }
+    
+    if (S_ISDIR(s.st_mode)) {
+        error_s("%s is a directory", path);
+        return NULL;
+    }
+
+read:
+    
+    file = fopen(path, type);
+    
+    if (file == NULL) {
+        error_s("failed to %s file %s: %s", type[0] == 'r' ? "read" : "write", path, strerror(errno));
+    }
+    
+    return file;
+}
+
+FILE* get_file(const char* path, const char* type) {
+    FILE* file = get_file_s(path, type);
+    if (file == NULL) exit(EXIT_FAILURE);
+    return file;
+}
+
+int get_tty (void) {
+    int fd = open(_PATH_TTY, O_RDONLY);
+    if (fd < 0) error("failed to get tty: %s", strerror(errno));
+    return fd;
+}
+
+FILE* get_tty_stream(char* type) {
+    int fd = get_tty();
+    FILE* file = fdopen(fd, type);
+    if (file == NULL) {
+        error("failed to open tty stream: %s", strerror(errno));
+    }
+    return file;
+}