Author: ArcRiley
Date: 2009-01-13 22:17:55 -0500 (Tue, 13 Jan 2009)
New Revision: 1476
Modified:
trunk/concordance/src/utils.c
trunk/concordance/src/utils.h
Log:
new concordStrToUI function for fast gchar* -> guint conversion with easy error
checking. Example:
if (!concordStrToUI(input, &result)) {error condition};
Modified: trunk/concordance/src/utils.c
===================================================================
--- trunk/concordance/src/utils.c 2009-01-13 21:45:14 UTC (rev 1475)
+++ trunk/concordance/src/utils.c 2009-01-14 03:17:55 UTC (rev 1476)
@@ -130,3 +130,46 @@
return g_ucs4_to_utf8((gunichar*) uni, len, NULL, NULL, NULL);
#endif
}
+
+
+gboolean
+concordStrToUI(const gchar* string, guint* result) { /*\
+ cdef : \*/
+ gint d;
+ guint i = 0;
+ guint r = 0;
+
+ /* return error now in case of empty string */
+ if (*string == '\0')
+ return FALSE;
+
+ /* continue until hit end of string */
+ while (string[i] != '\0') {
+ /* shift existing value up by 10, ie total input "92":
+ i=0, r=0, r*10=0, string[0] = "9", r = 0 + 9 = 9
+ i=1, r=9, r*10=90, string[1] = "2", r = 90 + 2 = 92
+ i=2, which is \0, so we exit while loop
+ */
+ r = r * 10;
+
+ /* get digit value from string position and test it.
+
+ gint g_ascii_digit_value (gchar c);
+ Returns -1 on error.
+ */
+ d = g_ascii_digit_value(string[i]);
+ if (d == -1)
+ return FALSE;
+
+ r+=d; /* add d to r, see above */
+ i++; /* increment i for the next loop */
+
+ /* prevent wasted processing time or overflow on long strings */
+ if (i == 10)
+ return FALSE;
+ }
+
+ /* pass r to the result pointer and return */
+ *result = r;
+ return TRUE;
+}
Modified: trunk/concordance/src/utils.h
===================================================================
--- trunk/concordance/src/utils.h 2009-01-13 21:45:14 UTC (rev 1475)
+++ trunk/concordance/src/utils.h 2009-01-14 03:17:55 UTC (rev 1476)
@@ -53,5 +53,6 @@
GMainContext* context);
gchar* concordSearchAttributes (const gchar**, const gchar*);
gchar* concordPyUnicodeToUTF8 (PyObject* unicode);
+gboolean concordStrToUI (const gchar* string, guint* result);
#endif
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