118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
/*-
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* Copyright (c) 2012 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $OpenPAM: openpam_straddch.c 938 2017-04-30 21:34:42Z des $
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <errno.h>
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#include <stdlib.h>
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#include <security/pam_appl.h>
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#include "openpam_impl.h"
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#define MIN_STR_SIZE 32
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/*
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* OpenPAM extension
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*
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* Add a character to a string, expanding the buffer if needed.
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*/
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int
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openpam_straddch(char **str, size_t *size, size_t *len, int ch)
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{
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size_t tmpsize;
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char *tmpstr;
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if (*str == NULL) {
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/* initial allocation */
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tmpsize = MIN_STR_SIZE;
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if ((tmpstr = malloc(tmpsize)) == NULL) {
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openpam_log(PAM_LOG_ERROR, "malloc(): %m");
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errno = ENOMEM;
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return (-1);
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}
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*str = tmpstr;
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*size = tmpsize;
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*len = 0;
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} else if (ch != 0 && *len + 1 >= *size) {
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/* additional space required */
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tmpsize = *size * 2;
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if ((tmpstr = realloc(*str, tmpsize)) == NULL) {
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openpam_log(PAM_LOG_ERROR, "realloc(): %m");
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errno = ENOMEM;
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return (-1);
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}
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*size = tmpsize;
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*str = tmpstr;
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}
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if (ch != 0) {
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(*str)[*len] = ch;
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++*len;
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}
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(*str)[*len] = '\0';
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return (0);
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}
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/**
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* The =openpam_straddch function appends a character to a dynamically
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* allocated NUL-terminated buffer, reallocating the buffer as needed.
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*
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* The =str argument points to a variable containing either a pointer to
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* an existing buffer or =NULL.
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* If the value of the variable pointed to by =str is =NULL, a new buffer
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* is allocated.
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*
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* The =size and =len argument point to variables used to hold the size
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* of the buffer and the length of the string it contains, respectively.
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*
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* The final argument, =ch, is the character that should be appended to
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* the string. If =ch is 0, nothing is appended, but a new buffer is
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* still allocated if =str is NULL. This can be used to "bootstrap" the
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* string.
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*
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* If a new buffer is allocated or an existing buffer is reallocated to
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* make room for the additional character, =str and =size are updated
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* accordingly.
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*
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* The =openpam_straddch function ensures that the buffer is always
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* NUL-terminated.
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*
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* If the =openpam_straddch function is successful, it increments the
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* integer variable pointed to by =len (unless =ch was 0) and returns 0.
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* Otherwise, it leaves the variables pointed to by =str, =size and =len
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* unmodified, sets :errno to =ENOMEM and returns -1.
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*
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* AUTHOR DES
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*/
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