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/*-
* SPDX-FileCopyrightText: Peter Pentchev <roam@ringlet.net>
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <err.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "confget.h"
#include "confget_common.h"
#include "readaline.h"
/* Is conffile pointing to stdin? */
static bool is_stdin;
/***
* Function:
* common_openfile - open any type of file for reading
* Inputs:
* None.
* Returns:
* 0 on success, -1 on error.
* Modifies:
* Stores the opened file into conffile.
*/
void
common_openfile(void)
{
if (filename == NULL)
errx(1, "No configuration file name specified");
if (strcmp(filename, "-") == 0) {
conffile = stdin;
is_stdin = true;
return;
}
FILE * const ifp = fopen(filename, "r");
if (ifp == NULL)
err(1, "Opening the input file %s", filename);
conffile = ifp;
is_stdin = false;
}
/***
* Function:
* common_openfile_null - do not open any file for methods that do not
* take their input from files
* Inputs:
* None.
* Returns:
* Nothing.
* Modifies:
* Stores a null value into conffile.
*/
void
common_openfile_null(void)
{
conffile = NULL;
is_stdin = false;
}
/***
* Function:
* common_closefile - close a scanned file
* Inputs:
* None.
* Returns:
* Nothing; exits on error.
* Modifies:
* Closes the file pointed to by fp.
*/
void
common_closefile(void)
{
if (conffile == NULL)
return;
if (!is_stdin)
if (fclose(conffile) == EOF)
err(1, "Could not close the config file");
conffile = NULL;
}
/***
* Function:
* confgetline - read a line from a file
* Inputs:
* fp - the file to read from
* line - a pointer to a location to store the line
* n - the location to store the line length
* Returns:
* The line pointer on success, NULL on error or EOF.
* Modifies:
* Reallocates a buffer at *line to as much as needed.
*/
char *
confgetline(FILE * const fp, char ** const line, size_t * const len)
{
#if defined(HAVE_GETLINE)
ssize_t r = getline(line, len, fp);
if (r == -1)
return (NULL);
while (r > 0 && ((*line)[r - 1] == '\r' || (*line)[r - 1] == '\n'))
(*line)[--r] = '\0';
return (*line);
#elif defined(HAVE_FGETLN)
size_t n;
char * const p = fgetln(fp, &n);
if (p == NULL)
return (NULL);
while (n > 0 && (p[n - 1] == '\r' || p[n - 1] == '\n'))
n--;
char *q;
if (*line == NULL || *len < n + 1) {
q = realloc(*line, n + 1);
if (q == NULL)
return (NULL);
*line = q;
*len = n + 1;
} else {
q = *line;
}
memcpy(q, p, n);
q[n] = '\0';
return (q);
#elif !defined(CONFGET_MAKEDEP)
#error Neither HAVE_GETLINE nor HAVE_FGETLN defined!
#endif
}
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