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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Roland Mainz <roland mainz@informatik.med.uni-giessen.de>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef _plstr_h
+#define _plstr_h
+
+/*
+ * plstr.h
+ *
+ * This header file exports the API to the NSPR portable library or string-
+ * handling functions.  
+ * 
+ * This API was not designed as an "optimal" or "ideal" string library; it 
+ * was based on the good ol' unix string.3 functions, and was written to
+ *
+ *  1) replace the libc functions, for cross-platform consistency, 
+ *  2) complete the API on platforms lacking common functions (e.g., 
+ *     strcase*), and
+ *  3) to implement some obvious "closure" functions that I've seen
+ *     people hacking around in our code.
+ *
+ * Point number three largely means that most functions have an "strn"
+ * limited-length version, and all comparison routines have a non-case-
+ * sensitive version available.
+ */
+
+#include "prtypes.h"
+
+PR_BEGIN_EXTERN_C
+/*
+ * PL_strlen
+ *
+ * Returns the length of the provided string, not including the trailing '\0'.
+ */
+
+PR_EXTERN(PRUint32)
+PL_strlen(const char *str);
+
+/*
+ * PL_strnlen
+ *
+ * Returns the length of the provided string, not including the trailing '\0',
+ * up to the indicated maximum.  The string will not be examined beyond the
+ * maximum; if no terminating '\0' is found, the maximum will be returned.
+ */
+
+PR_EXTERN(PRUint32)
+PL_strnlen(const char *str, PRUint32 max);
+
+/*
+ * PL_strcpy
+ *
+ * Copies the source string, up to and including the trailing '\0', into the
+ * destination buffer.  It does not (can not) verify that the destination
+ * buffer is large enough.  It returns the "dest" argument.
+ */
+
+PR_EXTERN(char *)
+PL_strcpy(char *dest, const char *src);
+
+/*
+ * PL_strncpy
+ *
+ * Copies the source string into the destination buffer, up to and including
+ * the trailing '\0' or up to and including the max'th character, whichever
+ * comes first.  It does not (can not) verify that the destination buffer is
+ * large enough.  If the source string is longer than the maximum length,
+ * the result will *not* be null-terminated (JLRU).
+ */
+
+PR_EXTERN(char *)
+PL_strncpy(char *dest, const char *src, PRUint32 max);
+
+/*
+ * PL_strncpyz
+ *
+ * Copies the source string into the destination buffer, up to and including 
+ * the trailing '\0' or up but not including the max'th character, whichever 
+ * comes first.  It does not (can not) verify that the destination buffer is
+ * large enough.  The destination string is always terminated with a '\0',
+ * unlike the traditional libc implementation.  It returns the "dest" argument.
+ *
+ * NOTE: If you call this with a source "abcdefg" and a max of 5, the 
+ * destination will end up with "abcd\0" (i.e., its strlen length will be 4)!
+ *
+ * This means you can do this:
+ *
+ *     char buffer[ SOME_SIZE ];
+ *     PL_strncpyz(buffer, src, sizeof(buffer));
+ *
+ * and the result will be properly terminated.
+ */
+
+PR_EXTERN(char *)
+PL_strncpyz(char *dest, const char *src, PRUint32 max);
+
+/*
+ * PL_strdup
+ *
+ * Returns a pointer to a malloc'd extent of memory containing a duplicate
+ * of the argument string.  The size of the allocated extent is one greater
+ * than the length of the argument string, because of the terminator.  A
+ * null argument, like a zero-length argument, will result in a pointer to
+ * a one-byte extent containing the null value.  This routine returns null
+ * upon malloc failure.
+ */
+
+PR_EXTERN(char *)
+PL_strdup(const char *s);
+
+/*
+ * PL_strfree
+ *
+ * Free memory allocated by PL_strdup
+ */
+
+PR_EXTERN(void)
+PL_strfree(char *s);
+
+/*
+ * PL_strndup
+ *
+ * Returns a pointer to a malloc'd extent of memory containing a duplicate
+ * of the argument string, up to the maximum specified.  If the argument
+ * string has a length greater than the value of the specified maximum, the
+ * return value will be a pointer to an extent of memory of length one
+ * greater than the maximum specified.  A null string, a zero-length string,
+ * or a zero maximum will all result in a pointer to a one-byte extent
+ * containing the null value.  This routine returns null upon malloc failure.
+ */
+
+PR_EXTERN(char *)
+PL_strndup(const char *s, PRUint32 max);
+
+/*
+ * PL_strcat
+ *
+ * Appends a copy of the string pointed to by the second argument to the
+ * end of the string pointed to by the first.  The destination buffer is
+ * not (can not be) checked for sufficient size.  A null destination
+ * argument returns null; otherwise, the first argument is returned.
+ */
+
+PR_EXTERN(char *)
+PL_strcat(char *dst, const char *src);
+
+/*
+ * PL_strncat
+ *
+ * Appends a copy of the string pointed to by the second argument, up to
+ * the maximum size specified, to the end of the string pointed to by the
+ * first.  The destination buffer is not (can not be) checked for sufficient
+ * size.  A null destination argument returns null; otherwise, the first 
+ * argument is returned.  If the maximum size limits the copy, then the
+ * result will *not* be null-terminated (JLRU).  A null destination
+ * returns null; otherwise, the destination argument is returned.
+ */
+
+PR_EXTERN(char *)
+PL_strncat(char *dst, const char *src, PRUint32 max);
+
+/*
+ * PL_strcatn
+ *
+ * Appends a copy of the string pointed to by the third argument, to the
+ * end of the string pointed to by the first.  The second argument specifies
+ * the maximum size of the destination buffer, including the null termination.
+ * If the existing string in dst is longer than the max, no action is taken.
+ * The resulting string will be null-terminated.  A null destination returns
+ * null; otherwise, the destination argument is returned.
+ */
+
+PR_EXTERN(char *)
+PL_strcatn(char *dst, PRUint32 max, const char *src);
+
+/*
+ * PL_strcmp
+ *
+ * Returns an integer, the sign of which -- positive, zero, or negative --
+ * reflects the lexical sorting order of the two strings indicated.  The
+ * result is positive if the first string comes after the second.  The
+ * NSPR implementation is not i18n.
+ */
+
+PR_EXTERN(PRIntn)
+PL_strcmp(const char *a, const char *b);
+
+/*
+ * PL_strncmp
+ * 
+ * Returns an integer, the sign of which -- positive, zero, or negative --
+ * reflects the lexical sorting order of the two strings indicated, up to
+ * the maximum specified.  The result is positive if the first string comes 
+ * after the second.  The NSPR implementation is not i18n.  If the maximum
+ * is zero, only the existance or non-existance (pointer is null) of the
+ * strings is compared.
+ */
+
+PR_EXTERN(PRIntn)
+PL_strncmp(const char *a, const char *b, PRUint32 max);
+
+/*
+ * PL_strcasecmp
+ *
+ * Returns an integer, the sign of which -- positive, zero or negative --
+ * reflects the case-insensitive lexical sorting order of the two strings
+ * indicated.  The result is positive if the first string comes after the 
+ * second.  The NSPR implementation is not i18n.
+ */
+
+PR_EXTERN(PRIntn)
+PL_strcasecmp(const char *a, const char *b);
+
+/*
+ * PL_strncasecmp
+ *
+ * Returns an integer, the sign of which -- positive, zero or negative --
+ * reflects the case-insensitive lexical sorting order of the first n characters
+ * of the two strings indicated.  The result is positive if the first string comes 
+ * after the second.  The NSPR implementation is not i18n.
+ */
+
+PR_EXTERN(PRIntn)
+PL_strncasecmp(const char *a, const char *b, PRUint32 max);
+
+/*
+ * PL_strchr
+ *
+ * Returns a pointer to the first instance of the specified character in the
+ * provided string.  It returns null if the character is not found, or if the
+ * provided string is null.  The character may be the null character.
+ */
+
+PR_EXTERN(char *)
+PL_strchr(const char *s, char c);
+
+/*
+ * PL_strrchr
+ *
+ * Returns a pointer to the last instance of the specified character in the
+ * provided string.  It returns null if the character is not found, or if the
+ * provided string is null.  The character may be the null character.
+ */
+
+PR_EXTERN(char *)
+PL_strrchr(const char *s, char c);
+
+/*
+ * PL_strnchr
+ * 
+ * Returns a pointer to the first instance of the specified character within the
+ * first n characters of the provided string.  It returns null if the character
+ * is not found, or if the provided string is null.  The character may be the
+ * null character.
+ */
+
+PR_EXTERN(char *)
+PL_strnchr(const char *s, char c, PRUint32 n);
+
+/*
+ * PL_strnrchr
+ *
+ * Returns a pointer to the last instance of the specified character within the
+ * first n characters of the provided string.  It returns null if the character is
+ * not found, or if the provided string is null.  The character may be the null
+ * character.
+ */
+
+PR_EXTERN(char *)
+PL_strnrchr(const char *s, char c, PRUint32 n);
+
+/*
+ * NOTE: Looking for strcasechr, strcaserchr, strncasechr, or strncaserchr?
+ * Use strpbrk, strprbrk, strnpbrk or strnprbrk.
+ */
+
+/*
+ * PL_strpbrk
+ *
+ * Returns a pointer to the first instance in the first string of any character
+ * (not including the terminating null character) of the second string.  It returns
+ * null if either string is null.
+ */
+
+PR_EXTERN(char *)
+PL_strpbrk(const char *s, const char *list);
+
+/*
+ * PL_strprbrk
+ *
+ * Returns a pointer to the last instance in the first string of any character
+ * (not including the terminating null character) of the second string.  It returns
+ * null if either string is null.
+ */
+
+PR_EXTERN(char *)
+PL_strprbrk(const char *s, const char *list);
+
+/*
+ * PL_strnpbrk
+ *
+ * Returns a pointer to the first instance (within the first n characters) of any
+ * character (not including the terminating null character) of the second string.
+ * It returns null if either string is null.
+ */
+
+PR_EXTERN(char *)
+PL_strnpbrk(const char *s, const char *list, PRUint32 n);
+
+/*
+ * PL_strnprbrk
+ *
+ * Returns a pointer to the last instance (within the first n characters) of any
+ * character (not including the terminating null character) of the second string.
+ * It returns null if either string is null.
+ */
+
+PR_EXTERN(char *)
+PL_strnprbrk(const char *s, const char *list, PRUint32 n);
+
+/*
+ * PL_strstr
+ *
+ * Returns a pointer to the first instance of the little string within the
+ * big one.  It returns null if either string is null.
+ */
+
+PR_EXTERN(char *)
+PL_strstr(const char *big, const char *little);
+
+/*
+ * PL_strrstr
+ *
+ * Returns a pointer to the last instance of the little string within the big one.
+ * It returns null if either string is null.
+ */
+
+PR_EXTERN(char *)
+PL_strrstr(const char *big, const char *little);
+
+/*
+ * PL_strnstr
+ *
+ * Returns a pointer to the first instance of the little string within the first
+ * n characters of the big one.  It returns null if either string is null.  It
+ * returns null if the length of the little string is greater than n.
+ */
+
+PR_EXTERN(char *)
+PL_strnstr(const char *big, const char *little, PRUint32 n);
+
+/*
+ * PL_strnrstr
+ *
+ * Returns a pointer to the last instance of the little string within the first
+ * n characters of the big one.  It returns null if either string is null.  It
+ * returns null if the length of the little string is greater than n.
+ */
+
+PR_EXTERN(char *)
+PL_strnrstr(const char *big, const char *little, PRUint32 max);
+
+/*
+ * PL_strcasestr
+ *
+ * Returns a pointer to the first instance of the little string within the big one,
+ * ignoring case.  It returns null if either string is null.
+ */
+
+PR_EXTERN(char *)
+PL_strcasestr(const char *big, const char *little);
+
+/*
+ * PL_strcaserstr
+ *
+ * Returns a pointer to the last instance of the little string within the big one,
+ * ignoring case.  It returns null if either string is null.
+ */
+
+PR_EXTERN(char *)
+PL_strcaserstr(const char *big, const char *little);
+
+/*
+ * PL_strncasestr
+ *
+ * Returns a pointer to the first instance of the little string within the first
+ * n characters of the big one, ignoring case.  It returns null if either string is 
+ * null.  It returns null if the length of the little string is greater than n.
+ */
+
+PR_EXTERN(char *)
+PL_strncasestr(const char *big, const char *little, PRUint32 max);
+
+/*
+ * PL_strncaserstr
+ *
+ * Returns a pointer to the last instance of the little string within the first
+ * n characters of the big one, ignoring case.  It returns null if either string is
+ * null.  It returns null if the length of the little string is greater than n.
+ */
+
+PR_EXTERN(char *)
+PL_strncaserstr(const char *big, const char *little, PRUint32 max);
+
+/*
+ * PL_strtok_r
+ *
+ * Splits the string s1 into tokens, separated by one or more characters
+ * from the separator string s2.  The argument lasts points to a
+ * user-supplied char * pointer in which PL_strtok_r stores information
+ * for it to continue scanning the same string.
+ *
+ * In the first call to PL_strtok_r, s1 points to a string and the value
+ * of *lasts is ignored.  PL_strtok_r returns a pointer to the first
+ * token, writes '\0' into the character following the first token, and
+ * updates *lasts.
+ *
+ * In subsequent calls, s1 is null and lasts must stay unchanged from the
+ * previous call.  The separator string s2 may be different from call to
+ * call.  PL_strtok_r returns a pointer to the next token in s1.  When no
+ * token remains in s1, PL_strtok_r returns null.
+ */
+
+PR_EXTERN(char *)
+PL_strtok_r(char *s1, const char *s2, char **lasts);
+
+/*
+ * Things not (yet?) included: strspn/strcspn, strsep.
+ * memchr, memcmp, memcpy, memccpy, index, rindex, bcmp, bcopy, bzero.
+ * Any and all i18n/l10n stuff.
+ */
+
+PR_END_EXTERN_C
+
+#endif /* _plstr_h */