/src/libzip/lib/zip_error_strerror.c

Source
/*
  zip_error_sterror.c -- get string representation of struct zip_error
  Copyright (C) 1999-2025 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.
  The authors can be contacted at <info@libzip.org>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
  3. The names of the authors may not be used to endorse or promote
     products derived from this software without specific prior
     written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


#include "zipint.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <zlib.h>

ZIP_EXTERN const char *zip_error_strerror(zip_error_t *err) {
    const char *zip_error_string, *system_error_string;
    char *s;
    char *system_error_buffer = NULL;

    zip_error_fini(err);

    if (err->zip_err < 0 || err->zip_err >= _zip_err_str_count) {
        system_error_buffer = (char *)malloc(128);
        if (system_error_buffer == NULL) {
            return _zip_err_str[ZIP_ER_MEMORY].description;
        }
        snprintf_s(system_error_buffer, 128, "Unknown error %d", err->zip_err);
        system_error_buffer[128 - 1] = '\0'; /* make sure string is NUL-terminated */
        zip_error_string = NULL;
        system_error_string = system_error_buffer;
    }
    else {
        zip_error_string = _zip_err_str[err->zip_err].description;

        switch (_zip_err_str[err->zip_err].type) {
        case ZIP_ET_SYS: {
            size_t len = strerrorlen_s(err->sys_err) + 1;
            system_error_buffer = malloc(len);
            if (system_error_buffer == NULL) {
                return _zip_err_str[ZIP_ER_MEMORY].description;
            }
            strerror_s(system_error_buffer, len, err->sys_err);
            system_error_string = system_error_buffer;
            break;
        }

        case ZIP_ET_ZLIB:
            system_error_string = zError(err->sys_err);
            break;

        case ZIP_ET_LIBZIP: {
            zip_uint8_t error = GET_ERROR_FROM_DETAIL(err->sys_err);
            int index = GET_INDEX_FROM_DETAIL(err->sys_err);

            if (error == 0) {
                system_error_string = NULL;
            }
            else if (error >= _zip_err_details_count) {
                system_error_buffer = (char *)malloc(128);
                if (system_error_buffer == NULL) {
                    return _zip_err_str[ZIP_ER_MEMORY].description;
                }
                snprintf_s(system_error_buffer, 128, "invalid detail error %u", error);
                system_error_buffer[128 - 1] = '\0'; /* make sure string is NUL-terminated */
                system_error_string = system_error_buffer;
            }
            else if (_zip_err_details[error].type == ZIP_DETAIL_ET_ENTRY && index < MAX_DETAIL_INDEX) {
                system_error_buffer = (char *)malloc(128);
                if (system_error_buffer == NULL) {
                    return _zip_err_str[ZIP_ER_MEMORY].description;
                }
                snprintf_s(system_error_buffer, 128, "entry %d: %s", index, _zip_err_details[error].description);
                system_error_buffer[128 - 1] = '\0'; /* make sure string is NUL-terminated */
                system_error_string = system_error_buffer;
            }
            else {
                system_error_string = _zip_err_details[error].description;
            }
            break;
        }

        default:
            system_error_string = NULL;
        }
    }

    if (system_error_string == NULL) {
        free(system_error_buffer);
        return zip_error_string;
    }
    else {
        size_t length = strlen(system_error_string);
        if (zip_error_string) {
            size_t length_error = strlen(zip_error_string);
            if (length + length_error + 2 < length) {
                free(system_error_buffer);
                return _zip_err_str[ZIP_ER_MEMORY].description;
            }
            length += length_error + 2;
        }
        if (length == SIZE_MAX || (s = (char *)malloc(length + 1)) == NULL) {
            free(system_error_buffer);
            return _zip_err_str[ZIP_ER_MEMORY].description;
        }

        snprintf_s(s, length + 1, "%s%s%s", (zip_error_string ? zip_error_string : ""), (zip_error_string ? ": " : ""), system_error_string);
        err->str = s;

        free(system_error_buffer);
        return s;
    }
}

Line	Count	Source
1		/*
2		zip_error_sterror.c -- get string representation of struct zip_error
3		Copyright (C) 1999-2025 Dieter Baron and Thomas Klausner
4
5		This file is part of libzip, a library to manipulate ZIP archives.
6		The authors can be contacted at <info@libzip.org>
7
8		Redistribution and use in source and binary forms, with or without
9		modification, are permitted provided that the following conditions
10		are met:
11		1. Redistributions of source code must retain the above copyright
12		notice, this list of conditions and the following disclaimer.
13		2. Redistributions in binary form must reproduce the above copyright
14		notice, this list of conditions and the following disclaimer in
15		the documentation and/or other materials provided with the
16		distribution.
17		3. The names of the authors may not be used to endorse or promote
18		products derived from this software without specific prior
19		written permission.
20
21		THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
22		OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23		WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24		ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25		DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26		DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27		GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28		INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29		IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30		OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31		IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32		*/
33
34
35		#include "zipint.h"
36
37		#include <stdio.h>
38		#include <stdlib.h>
39		#include <string.h>
40		#include <zlib.h>
41
42	590	ZIP_EXTERN const char zip_error_strerror(zip_error_t err) {
43	590	const char zip_error_string, system_error_string;
44	590	char *s;
45	590	char *system_error_buffer = NULL;
46
47	590	zip_error_fini(err);
48
49	590	if (err->zip_err < 0 \|\| err->zip_err >= _zip_err_str_count) {
50	0	system_error_buffer = (char *)malloc(128);
51	0	if (system_error_buffer == NULL) {
52	0	return _zip_err_str[ZIP_ER_MEMORY].description;
53	0	}
54	0	snprintf_s(system_error_buffer, 128, "Unknown error %d", err->zip_err);
55	0	system_error_buffer[128 - 1] = '\0'; /* make sure string is NUL-terminated */
56	0	zip_error_string = NULL;
57	0	system_error_string = system_error_buffer;
58	0	}
59	590	else {
60	590	zip_error_string = _zip_err_str[err->zip_err].description;
61
62	590	switch (_zip_err_str[err->zip_err].type) {
63	0	case ZIP_ET_SYS: {
64	0	size_t len = strerrorlen_s(err->sys_err) + 1;
65	0	system_error_buffer = malloc(len);
66	0	if (system_error_buffer == NULL) {
67	0	return _zip_err_str[ZIP_ER_MEMORY].description;
68	0	}
69	0	strerror_s(system_error_buffer, len, err->sys_err);
70	0	system_error_string = system_error_buffer;
71	0	break;
72	0	}
73
74	0	case ZIP_ET_ZLIB:
75	0	system_error_string = zError(err->sys_err);
76	0	break;
77
78	130	case ZIP_ET_LIBZIP: {
79	130	zip_uint8_t error = GET_ERROR_FROM_DETAIL(err->sys_err);
80	130	int index = GET_INDEX_FROM_DETAIL(err->sys_err);
81
82	130	if (error == 0) {
83	0	system_error_string = NULL;
84	0	}
85	130	else if (error >= _zip_err_details_count) {
86	0	system_error_buffer = (char *)malloc(128);
87	0	if (system_error_buffer == NULL) {
88	0	return _zip_err_str[ZIP_ER_MEMORY].description;
89	0	}
90	0	snprintf_s(system_error_buffer, 128, "invalid detail error %u", error);
91	0	system_error_buffer[128 - 1] = '\0'; /* make sure string is NUL-terminated */
92	0	system_error_string = system_error_buffer;
93	0	}
94	130	else if (_zip_err_details[error].type == ZIP_DETAIL_ET_ENTRY && index < MAX_DETAIL_INDEX) {
95	110	system_error_buffer = (char *)malloc(128);
96	110	if (system_error_buffer == NULL) {
97	0	return _zip_err_str[ZIP_ER_MEMORY].description;
98	0	}
99	110	snprintf_s(system_error_buffer, 128, "entry %d: %s", index, _zip_err_details[error].description);
100	110	system_error_buffer[128 - 1] = '\0'; /* make sure string is NUL-terminated */
101	110	system_error_string = system_error_buffer;
102	110	}
103	20	else {
104	20	system_error_string = _zip_err_details[error].description;
105	20	}
106	130	break;
107	130	}
108
109	460	default:
110	460	system_error_string = NULL;
111	590	}
112	590	}
113
114	590	if (system_error_string == NULL) {
115	460	free(system_error_buffer);
116	460	return zip_error_string;
117	460	}
118	130	else {
119	130	size_t length = strlen(system_error_string);
120	130	if (zip_error_string) {
121	130	size_t length_error = strlen(zip_error_string);
122	130	if (length + length_error + 2 < length) {
123	0	free(system_error_buffer);
124	0	return _zip_err_str[ZIP_ER_MEMORY].description;
125	0	}
126	130	length += length_error + 2;
127	130	}
128	130	if (length == SIZE_MAX \|\| (s = (char *)malloc(length + 1)) == NULL) {
129	0	free(system_error_buffer);
130	0	return _zip_err_str[ZIP_ER_MEMORY].description;
131	0	}
132
133	130	snprintf_s(s, length + 1, "%s%s%s", (zip_error_string ? zip_error_string : ""), (zip_error_string ? ": " : ""), system_error_string);
134	130	err->str = s;
135
136	130	free(system_error_buffer);
137	130	return s;
138	130	}
139	590	}

Coverage Report

Created: 2026-07-30 07:17