nkiss

commit 42d666065f92bc9f92ecdb98952019753b3c4bac
parent ba5400a9eec60ae4eb69cff1ee6224b2c8df765c
Author: Nihal Jere <nihal@nihaljere.xyz>
Date:   Wed, 17 Feb 2021 19:05:06 -0600

util.*: add mkdirs and strrepl

mkdirs creates a directory given a path, creating parent directories as
needed (like mkdir -p)

strrepl substitutes a character in a string with another, and is used in
mkdirs

Diffstat:
M
util.c
 | 
36
++++++++++++++++++++++++++++++++++++
M
util.h
 | 
2
++

2 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/util.c b/util.c
@@ -1,4 +1,7 @@
 /* See LICENSE file for copyright and license details. */
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -56,3 +59,36 @@ vstrcmp(const void *p1, const void *p2)
     return strcmp((const char *) p1, (const char *) p2);
 }
 
+/* replace occurences of a with b in str, starting from end */
+int
+strrepl(char *str, const char a, const char b)
+{
+    for (char *p = str + strlen(str); p >= str; p--) {
+        if (*p == a)
+            *p = b;
+    }
+}
+
+/* essentially mkdir -p */
+int
+mkdirs(const char *path)
+{
+    size_t len = strlen(path);
+    char dir[len];
+    char *end = dir;
+
+    strcpy(dir, path);
+    /* dir+1 to avoid removing leading /, and mkdir erroring out */
+    strrepl(dir+1, '/', 0);
+
+    do {
+        if (*end == 0) {
+            if (mkdir(dir, S_IRWXU) == -1 && errno != EEXIST)
+                die("%s: %s:", __func__, path);
+            *end = '/';
+        }
+            
+    } while (end++ < dir+len);
+
+    return 0;
+}
diff --git a/util.h b/util.h
@@ -14,5 +14,7 @@ extern char *argv0;
 void warn(const char *, ...);
 void die(const char *, ...);
 int vstrcmp(const void *p1, const void *p2);
+int strrepl(char *str, const char a, const char b);
+int mkdirs(const char *path);
 
 #endif /* UTIL_H */