[zenity: 1/2] Makes progress to consider the decimal from percent update

[Arx Henrique Pereira da Cruz <arxcruz src gnome org>]

commit 0f413e6a23beec60b206f070f0f38f0dbddd8fb4
Author: Aurélio A. Heckert <aurium colivre coop br>
Date:   Mon Jun 18 18:09:17 2018 -0300

    Makes progress to consider the decimal from percent update
    
    Implements stof alternative to atof, to ignore locale settings.
    
    This also helps the time remaining calculation for long tasks.

 src/progress.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)
---
diff --git a/src/progress.c b/src/progress.c
index 1a5a68f..00bb8aa 100644
--- a/src/progress.c
+++ b/src/progress.c
@@ -105,6 +105,27 @@ zenity_progress_update_time_remaining (ZenityProgressData *progress_data) {
        }
 }
 
+static float
+stof(const char* s) {
+       float rez = 0, fact = 1;
+       if (*s == '-') {
+               s++;
+               fact = -1;
+       }
+       for (int point_seen = 0; *s; s++) {
+               if (*s == '.' || *s == ',') {
+                       point_seen = 1;
+                       continue;
+               }
+               int d = *s - '0';
+               if (d >= 0 && d <= 9) {
+                       if (point_seen) fact /= 10.0f;
+                       rez = rez * 10.0f + (float)d;
+               }
+       }
+       return rez * fact;
+}
+
 static gboolean
 zenity_progress_handle_stdin (
        GIOChannel *channel, GIOCondition condition, gpointer data) {
@@ -190,7 +211,7 @@ zenity_progress_handle_stdin (
                                        continue;
 
                                /* Now try to convert the thing to a number */
-                               percentage = CLAMP (atoi (string->str), 0, 100);
+                               percentage = CLAMP (stof (string->str), 0, 100);
 
                                gtk_progress_bar_set_fraction (
                                        GTK_PROGRESS_BAR (progress_bar), percentage / 100.0);