lacf_getline_impl.h

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/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license in the file COPYING
 * or http://www.opensource.org/licenses/CDDL-1.0.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file COPYING.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2023 Saso Kiselkov. All rights reserved.
 */
#ifndef _ACF_UTILS_LACF_GETLINE_IMPL_H_
#define _ACF_UTILS_LACF_GETLINE_IMPL_H_
 
#if defined(ACFUTILS_BUILD) || defined(ACFUTILS_GZIP_PARSER)
#include <zlib.h>
#endif
 
#include "core.h"
#include "safe_alloc.h"
 
#ifndef _LACF_GETLINE_INCLUDED
#error  "Don't include lacf_getline_impl.h directly. Include acfutils/helpers.h"
#endif
 
#ifdef  __cplusplus
extern "C" {
#endif
 
#if defined(ACFUTILS_BUILD) || defined(ACFUTILS_GZIP_PARSER)
UNUSED_ATTR static ssize_t
lacf_getline_impl(char **line_p, size_t *cap_p, void *fp, bool_t compressed)
#else   /* !defined(ACFUTILS_BUILD) && !defined(ACFUTILS_GZIP_PARSER) */
UNUSED_ATTR static ssize_t
lacf_getline_impl(char **line_p, size_t *cap_p, void *fp)
#endif  /* !defined(ACFUTILS_BUILD) && !defined(ACFUTILS_GZIP_PARSER) */
{
    ASSERT(line_p != NULL);
    ASSERT(cap_p != NULL);
    ASSERT(fp != NULL);
 
    char *line = *line_p;
    size_t cap = *cap_p, n = 0;
 
#if (defined(ACFUTILS_BUILD) || defined(ACFUTILS_GZIP_PARSER)) && \
    (APL || LIN)
    /* On POSIX we can use the libc version when uncompressed */
    if (!compressed)
        return (getline(line_p, cap_p, (FILE *)fp));
#endif  /* defined(ACFUTILS_BUILD) && (APL || LIN) */
    do {
        char *p;
 
        if (n + 1 >= cap) {
            cap += 256;
            line = (char *)safe_realloc(line, cap);
        }
        ASSERT(n < cap);
#if defined(ACFUTILS_BUILD) || defined(ACFUTILS_GZIP_PARSER)
        p = (compressed ? gzgets((gzFile)fp, &line[n], cap - n) :
            fgets(&line[n], cap - n, (FILE *)fp));
#else   /* !defined(ACFUTILS_BUILD) */
        p = fgets(&line[n], cap - n, (FILE *)fp);
#endif  /* !defined(ACFUTILS_BUILD) */
        if (p == NULL) {
            if (n != 0) {
                break;
            } else {
                *line_p = line;
                *cap_p = cap;
                return (-1);
            }
        }
        n = strlen(line);
    } while (n > 0 && line[n - 1] != '\n');
 
    *line_p = line;
    *cap_p = cap;
 
    return (n);
}
 
#ifdef  __cplusplus
}
#endif
 
#endif  /* _ACF_UTILS_LACF_GETLINE_IMPL_H_ */