1 files changed, 56 insertions, 0 deletions
diff --git a/src/util/balpar.c b/src/util/balpar.c
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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);
+}