From: n3rdopolis <bluescreen_avenger@verizon.net>
Date: Mon, 20 Mar 2023 02:39:12 +0000 (-0400)
Subject: ply-utils: Add ply_utf8_string_get_substring_range () to split UTF-8 strings at a... 
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=35819ff63e34855bb0e1e89a75c128038ce03a9a;p=thirdparty%2Fplymouth.git

ply-utils: Add ply_utf8_string_get_substring_range () to split UTF-8 strings at a number character, to a specified range
---

diff --git a/src/libply/ply-utils.c b/src/libply/ply-utils.c
index ed6b054a..6968a96c 100644
--- a/src/libply/ply-utils.c
+++ b/src/libply/ply-utils.c
@@ -776,6 +776,39 @@ ply_utf8_string_get_length (const char *string,
         return count;
 }
 
+char *
+ply_utf8_string_get_substring (const char *string,
+                               size_t      offset,
+                               size_t      range)
+{
+        int charlen;
+        size_t utf8_char_count = 0;
+        size_t utf8_byte_offset = 0, utf8_byte_range = 0;
+        ssize_t range_max;
+
+        range_max = strlen (string) + 1;
+
+        while (utf8_char_count < offset && range_max >= 0) {
+                charlen = ply_utf8_character_get_size (string + utf8_byte_offset, range_max);
+                if (charlen <= 0) break;
+                utf8_char_count++;
+                utf8_byte_offset += charlen;
+                range_max -= charlen;
+        }
+
+        utf8_char_count = 0;
+
+        while (utf8_char_count <= range && range_max >= 0) {
+                charlen = ply_utf8_character_get_size (string + utf8_byte_offset + utf8_byte_range, range_max);
+                if (charlen <= 0) break;
+                utf8_char_count++;
+                utf8_byte_range += charlen;
+                range_max -= charlen;
+        }
+
+        return strndup (string + utf8_byte_offset, utf8_byte_range);
+}
+
 char *
 ply_get_process_command_line (pid_t pid)
 {
diff --git a/src/libply/ply-utils.h b/src/libply/ply-utils.h
index 09507e09..8e0fa4dc 100644
--- a/src/libply/ply-utils.h
+++ b/src/libply/ply-utils.h
@@ -116,6 +116,9 @@ int ply_utf8_character_get_size (const char *string,
                                  size_t      n);
 int ply_utf8_string_get_length (const char *string,
                                 size_t      n);
+char *ply_utf8_string_get_substring (const char *string,
+                                     size_t      offset,
+                                     size_t      range);
 
 char *ply_get_process_command_line (pid_t pid);
 pid_t ply_get_process_parent_pid (pid_t pid);