+ in the interest of robustness, I added

[oweals/busybox.git] / utility.c

diff --git a/utility.c b/utility.c
index c3a102c5e1effdc24425b870ef170f7f42bb7acb..42b8dc1e96f28222ec4d7de2ed77fac9ed17b58b 100644 (file)
--- a/utility.c
+++ b/utility.c
@@ -1521,6 +1521,57 @@ extern int find_real_root_device_name(char* name)
 }
 #endif
 
+const unsigned int CSTRING_BUFFER_LENGTH = 128;
+/* recursive parser that returns cstrings of arbitrary length
+ * from a FILE* 
+ */
+static char *
+cstring_alloc(FILE* f, int depth)
+{
+    char *cstring;
+    char buffer[CSTRING_BUFFER_LENGTH];
+    int         target = CSTRING_BUFFER_LENGTH * depth;
+    int  i, len;
+    int  size;
+
+    /* fill buffer */
+    i = 0;
+    while ((buffer[i] = fgetc(f)) != EOF) {
+               if (buffer[i++] == 0x0a) { break; }
+               if (i == CSTRING_BUFFER_LENGTH) { break; }
+    }
+    len = i;
+
+    /* recurse or malloc? */
+    if (len == CSTRING_BUFFER_LENGTH) {
+               cstring = cstring_alloc(f, (depth + 1));
+    } else {
+               /* [special case] EOF */
+               if ((depth | len) == 0) { return NULL; }
+
+               /* malloc */
+               size = target + len + 1;
+               cstring = malloc(size);
+               if (!cstring) { return NULL; }
+               cstring[size - 1] = 0;
+    }
+
+    /* copy buffer */
+    if (cstring) {
+               memcpy(&cstring[target], buffer, len);
+    }
+    return cstring;
+}
+
+/* 
+ * wrapper around recursive cstring_alloc 
+ * it's the caller's responsibility to free the cstring
+ */ 
+char *
+cstring_lineFromFile(FILE *f)
+{
+    return cstring_alloc(f, 0);
+}
 
 /* END CODE */
 /*