add tail

1 files changed, 18 insertions, 2 deletions

diff --git a/src/shared.c b/src/shared.c
index b167e6f..8d0dcca 100644
--- a/src/shared.c
+++ b/src/shared.c
@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
+#include <sys/stat.h>
 
 void error(const char* format, ...) {
     va_list list;
@@ -15,14 +16,29 @@ void error(const char* format, ...) {
     exit(EXIT_FAILURE);
 }
 
-FILE* get_file(const char* path, const char* type) {
+FILE* get_file_s(const char* path, const char* type) {
+    struct stat s;
+    if (stat(path, &s) < 0) {
+        fprintf(stderr, "error: failed to read %s: %s\n", path, strerror(errno));
+        return NULL;
+    }
+    if (!S_ISREG(s.st_mode)) {
+        fprintf(stderr, "error: %s is not a file\n", path);
+        return NULL;
+    }
     FILE* file = fopen(path, type);
     if (file == NULL) {
-        error("error: failed to open file %s: %s", path, strerror(errno));
+        fprintf(stderr, "error: failed to open file %s: %s\n", 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;
+}
+
 long int get_number(const char* text) {
     char* end;
     long int n = strtol(text, &end, 10);