add support for reading and writing config and pair record files

1 files changed, 144 insertions, 0 deletions

diff --git a/src/utils.c b/src/utils.c
index ceef535..475a921 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -3,6 +3,7 @@
 
 Copyright (C) 2009      Hector Martin "marcan" <hector@marcansoft.com>
 Copyright (C) 2009      Nikias Bassen <nikias@gmx.li>
+Copyright (c) 2013      Federico Mena Quintero
 
 This library is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as
@@ -27,6 +28,8 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
+#include <stdarg.h>
+
 #include "utils.h"
 
 #include "log.h"
@@ -118,3 +121,144 @@ int collection_count(struct collection *col)
         }
         return cnt;
 }
+
+#ifndef HAVE_STPCPY
+/**
+ * Copy characters from one string into another
+ *
+ * @note: The strings should not overlap, as the behavior is undefined.
+ *
+ * @s1: The source string.
+ * @s2: The destination string.
+ *
+ * @return a pointer to the terminating `\0' character of @s1,
+ * or NULL if @s1 or @s2 is NULL.
+ */
+char *stpcpy(char * s1, const char * s2)
+{
+        if (s1 == NULL || s2 == NULL)
+                return NULL;
+
+        strcpy(s1, s2);
+
+        return s1 + strlen(s2);
+}
+#endif
+
+/**
+ * Concatenate strings into a newly allocated string
+ *
+ * @note: Specify NULL for the last string in the varargs list
+ *
+ * @str: The first string in the list
+ * @...: Subsequent strings.  Use NULL for the last item.
+ *
+ * @return a newly allocated string, or NULL if @str is NULL.  This will also
+ * return NULL and set errno to ENOMEM if memory is exhausted.
+ */
+char *string_concat(const char *str, ...)
+{
+        size_t len;
+        va_list args;
+        char *s;
+        char *result;
+        char *dest;
+
+        if (!str)
+                return NULL;
+
+        /* Compute final length */
+
+        len = strlen(str) + 1; /* plus 1 for the null terminator */
+
+        va_start(args, str);
+        s = va_arg(args, char *);
+        while (s) {
+                len += strlen(s);
+                s = va_arg(args, char*);
+        }
+        va_end(args);
+
+        /* Concat each string */
+
+        result = malloc(len);
+        if (!result)
+                return NULL; /* errno remains set */
+
+        dest = result;
+
+        dest = stpcpy(dest, str);
+
+        va_start(args, str);
+        s = va_arg(args, char *);
+        while (s) {
+                dest = stpcpy(dest, s);
+                s = va_arg(args, char *);
+        }
+        va_end(args);
+
+        return result;
+}
+
+void buffer_read_from_filename(const char *filename, char **buffer, uint64_t *length)
+{
+        FILE *f;
+        uint64_t size;
+
+        *length = 0;
+
+        f = fopen(filename, "rb");
+        if (!f) {
+                return;
+        }
+
+        fseek(f, 0, SEEK_END);
+        size = ftell(f);
+        rewind(f);
+
+        if (size == 0) {
+                fclose(f);
+                return;
+        }
+
+        *buffer = (char*)malloc(sizeof(char)*(size+1));
+        if (fread(*buffer, sizeof(char), size, f) != size) {
+                usbmuxd_log(LL_ERROR, "%s: ERROR: couldn't read %d bytes from %s\n", __func__, (int)size, filename);
+        }
+        fclose(f);
+
+        *length = size;
+}
+
+void buffer_write_to_filename(const char *filename, const char *buffer, uint64_t length)
+{
+        FILE *f;
+
+        f = fopen(filename, "wb");
+        if (f) {
+                fwrite(buffer, sizeof(char), length, f);
+                fclose(f);
+        }
+}
+
+int plist_write_to_filename(plist_t plist, const char *filename, enum plist_format_t format)
+{
+        char *buffer = NULL;
+        uint32_t length;
+
+        if (!plist || !filename)
+                return 0;
+
+        if (format == PLIST_FORMAT_XML)
+                plist_to_xml(plist, &buffer, &length);
+        else if (format == PLIST_FORMAT_BINARY)
+                plist_to_bin(plist, &buffer, &length);
+        else
+                return 0;
+
+        buffer_write_to_filename(filename, buffer, length);
+
+        free(buffer);
+
+        return 1;
+}