Move *.c and *.h into server/ directory.

[citadel.git] / webcit-ng / server / util.c

diff --git a/webcit-ng/server/util.c b/webcit-ng/server/util.c
new file mode 100644 (file)
index 0000000..72bf660
--- /dev/null
+++ b/webcit-ng/server/util.c
@@ -0,0 +1,97 @@
+//
+// Utility functions
+//
+// Copyright (c) 1996-2022 by the citadel.org team
+//
+// This program is open source software.  Use, duplication, or
+// disclosure are subject to the GNU General Public License v3.
+
+#include "webcit.h"
+
+
+// remove escaped strings from i.e. the url string (like %20 for blanks)
+int unescape_input(char *buf) {
+       unsigned int a, b;
+       char hex[3];
+       long buflen;
+       long len;
+
+       buflen = strlen(buf);
+
+       while ((buflen > 0) && (isspace(buf[buflen - 1]))) {
+               buf[buflen - 1] = 0;
+               buflen--;
+       }
+
+       a = 0;
+       while (a < buflen) {
+               if (buf[a] == '+')
+                       buf[a] = ' ';
+               if (buf[a] == '%') {
+                       // don't let % chars through, rather truncate the input.
+                       if (a + 2 > buflen) {
+                               buf[a] = '\0';
+                               buflen = a;
+                       }
+                       else {
+                               hex[0] = buf[a + 1];
+                               hex[1] = buf[a + 2];
+                               hex[2] = 0;
+                               b = 0;
+                               b = decode_hex(hex);
+                               buf[a] = (char) b;
+                               len = buflen - a - 2;
+                               if (len > 0)
+                                       memmove(&buf[a + 1], &buf[a + 3], len);
+
+                               buflen -= 2;
+                       }
+               }
+               a++;
+       }
+       return a;
+}
+
+
+// Supplied with a unix timestamp, generate a textual time/date stamp.
+// Caller owns the returned memory.
+char *http_datestring(time_t xtime) {
+
+       // HTTP Months - do not translate - these are not for human consumption
+       static char *httpdate_months[] = {
+               "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+               "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+       };
+
+       // HTTP Weekdays - do not translate - these are not for human consumption
+       static char *httpdate_weekdays[] = {
+               "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+       };
+
+       struct tm t;
+       long offset;
+       char offsign;
+       int n = 40;
+       char *buf = malloc(n);
+       if (!buf) {
+               return (NULL);
+       }
+
+       localtime_r(&xtime, &t);
+
+       // Convert "seconds west of GMT" to "hours/minutes offset"
+       offset = t.tm_gmtoff;
+       if (offset > 0) {
+               offsign = '+';
+       }
+       else {
+               offset = 0L - offset;
+               offsign = '-';
+       }
+       offset = ((offset / 3600) * 100) + (offset % 60);
+
+       snprintf(buf, n, "%s, %02d %s %04d %02d:%02d:%02d %c%04ld",
+                httpdate_weekdays[t.tm_wday],
+                t.tm_mday, httpdate_months[t.tm_mon], t.tm_year + 1900, t.tm_hour, t.tm_min, t.tm_sec, offsign, offset);
+       return (buf);
+}