/usr/include/calc/str.h is in apcalc-dev 2.12.5.0-1+b3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* str - string list routines
*
* Copyright (C) 1999-2007,2014 David I. Bell
*
* Calc is open software; you can redistribute it and/or modify it under
* the terms of the version 2.1 of the GNU Lesser General Public License
* as published by the Free Software Foundation.
*
* Calc is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
* Public License for more details.
*
* A copy of version 2.1 of the GNU Lesser General Public License is
* distributed with calc under the filename COPYING-LGPL. You should have
* received a copy with calc; if not, write to Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* @(#) $Revision: 30.3 $
* @(#) $Id: str.h,v 30.3 2014/08/24 21:56:51 chongo Exp $
* @(#) $Source: /usr/local/src/bin/calc/RCS/str.h,v $
*
* Under source code control: 1990/02/15 01:48:36
* File existed as early as: before 1990
*
* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
*/
#if !defined(INCLUDE_CALCSTRING_H)
#define INCLUDE_CALCSTRING_H
#if defined(CALC_SRC) /* if we are building from the calc source tree */
# include "calc/zmath.h"
#else
# include <calc/zmath.h>
#endif
struct string {
char *s_str;
size_t s_len;
long s_links;
struct string *s_next;
};
typedef struct string STRING;
typedef struct {
char *h_list; /* list of strings separated by nulls */
size_t h_used; /* characters used so far */
size_t h_avail; /* characters available for use */
long h_count; /* number of strings */
} STRINGHEAD;
E_FUNC void initstr(STRINGHEAD *hp);
E_FUNC char *addstr(STRINGHEAD *hp, char *str);
E_FUNC char *namestr(STRINGHEAD *hp, long n);
E_FUNC int findstr(STRINGHEAD *hp, char *str);
E_FUNC char *charstr(int ch);
E_FUNC char *addliteral(char *str);
E_FUNC long stringindex(char *str1, char *str2);
E_FUNC STRING *stralloc(void);
E_FUNC long addstring(char *str, size_t len);
E_FUNC STRING *charstring(int ch);
E_FUNC STRING *makestring(char *str);
E_FUNC STRING *makenewstring(char *str);
E_FUNC STRING *findstring(long index);
E_FUNC STRING *slink(STRING *);
E_FUNC void sfree(STRING *);
E_FUNC void fitstring(char *, long, long);
E_FUNC void strprint(STRING *);
E_FUNC void showstrings(void);
E_FUNC void showliterals(void);
EXTERN STRING _nullstring_;
#endif /* !INCLUDE_CALCSTRING_H */
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