+
+char *
+prphone(num)
+ char *num;
+{
+ register char *p;
+ int len;
+ static char pbuf[15];
+
+ /* don't touch anything if the user has their own formatting */
+ for (p = num; *p; ++p)
+ if (!isdigit(*p))
+ return(num);
+ len = p - num;
+ p = pbuf;
+ switch(len) {
+ case 11: /* +0-123-456-7890 */
+ *p++ = '+';
+ *p++ = *num++;
+ *p++ = '-';
+ /* FALLTHROUGH */
+ case 10: /* 012-345-6789 */
+ *p++ = *num++;
+ *p++ = *num++;
+ *p++ = *num++;
+ *p++ = '-';
+ /* FALLTHROUGH */
+ case 7: /* 012-3456 */
+ *p++ = *num++;
+ *p++ = *num++;
+ *p++ = *num++;
+ break;
+ case 5: /* x0-1234 */
+ *p++ = 'x';
+ *p++ = *num++;
+ break;
+ default:
+ return(num);
+ }
+ *p++ = '-';
+ *p++ = *num++;
+ *p++ = *num++;
+ *p++ = *num++;
+ *p++ = *num++;
+ *p = '\0';
+ return(pbuf);
+}