1 files changed, 50 insertions, 0 deletions
diff --git a/rushs/evalexpr/io_replace_line/replace_line.c b/rushs/evalexpr/io_replace_line/replace_line.c
new file mode 100644
index 0000000..7fd0e2a
--- /dev/null
+++ b/rushs/evalexpr/io_replace_line/replace_line.c
@@ -0,0 +1,50 @@
+#define _POSIX_C_SOURCE 200809L
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int replace_line(const char *file_in, const char *file_out, const char *content,
+                 int n)
+{
+    FILE *a = fopen(file_out, "w");
+    if (a == NULL)
+    {
+        return -1;
+    }
+    FILE *r = fopen(file_in, "r");
+    if (r == NULL)
+    {
+        return -1;
+    }
+
+    char *buf = NULL;
+    ssize_t e;
+    int l = 0;
+    size_t count = 0;
+    while ((e = getline(&buf, &count, r)) != 0 && e != -1)
+    {
+        if (l == n)
+        {
+            if (fputs(content, a) == EOF)
+            {
+                free(buf);
+                return -1;
+            }
+        }
+        else
+        {
+            if (fputs(buf, a) == EOF)
+            {
+                free(buf);
+                return -1;
+            }
+        }
+        l++;
+    }
+
+    fclose(a);
+    fclose(r);
+    free(buf);
+
+    return 0;
+}