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+/*++
+/* NAME
+/* balpar 3
+/* SUMMARY
+/* determine length of string in parentheses
+/* SYNOPSIS
+/* #include <stringops.h>
+/*
+/* size_t balpar(string, parens)
+/* const char *string;
+/* const char *parens;
+/* DESCRIPTION
+/* balpar() determines the length of a string enclosed in
+/* the specified parentheses, zero in case of error.
+/* SEE ALSO
+/* A balpar() routine appears in Brian W. Kernighan, P.J. Plauger:
+/* "Software Tools", Addison-Wesley 1976. This function is different.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+
+/* Utility library. */
+
+#include <stringops.h>
+
+/* balpar - return length of {text} */
+
+size_t balpar(const char *string, const char *parens)
+{
+ const char *cp;
+ int level;
+ int ch;
+
+ if (*string != parens[0])
+ return (0);
+ for (level = 1, cp = string + 1; (ch = *cp) != 0; cp++) {
+ if (ch == parens[1]) {
+ if (--level == 0)
+ return (cp - string + 1);
+ } else if (ch == parens[0]) {
+ level++;
+ }
+ }
+ return (0);
+}