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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);
}
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