/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	7.51k	ZIP_EXTERN const char zip_error_strerror(zip_error_t err) {
43	7.51k	const char zip_error_string, system_error_string;
44	7.51k	char *s;
45	7.51k	char *system_error_buffer = NULL;
46
47	7.51k	zip_error_fini(err);
48
49	7.51k	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	7.51k	else {
60	7.51k	zip_error_string = _zip_err_str[err->zip_err].description;
61
62	7.51k	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	1.71k	case ZIP_ET_LIBZIP: {
79	1.71k	zip_uint8_t error = GET_ERROR_FROM_DETAIL(err->sys_err);
80	1.71k	int index = GET_INDEX_FROM_DETAIL(err->sys_err);
81
82	1.71k	if (error == 0) {
83	0	system_error_string = NULL;
84	0	}
85	1.71k	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	1.71k	else if (_zip_err_details[error].type == ZIP_DETAIL_ET_ENTRY && index < MAX_DETAIL_INDEX) {
95	1.34k	system_error_buffer = (char *)malloc(128);
96	1.34k	if (system_error_buffer == NULL) {
97	0	return _zip_err_str[ZIP_ER_MEMORY].description;
98	0	}
99	1.34k	snprintf_s(system_error_buffer, 128, "entry %d: %s", index, _zip_err_details[error].description);
100	1.34k	system_error_buffer[128 - 1] = '\0'; /* make sure string is NUL-terminated */
101	1.34k	system_error_string = system_error_buffer;
102	1.34k	}
103	367	else {
104	367	system_error_string = _zip_err_details[error].description;
105	367	}
106	1.71k	break;
107	1.71k	}
108
109	5.79k	default:
110	5.79k	system_error_string = NULL;
111	7.51k	}
112	7.51k	}
113
114	7.51k	if (system_error_string == NULL) {
115	5.79k	free(system_error_buffer);
116	5.79k	return zip_error_string;
117	5.79k	}
118	1.71k	else {
119	1.71k	size_t length = strlen(system_error_string);
120	1.71k	if (zip_error_string) {
121	1.71k	size_t length_error = strlen(zip_error_string);
122	1.71k	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	1.71k	length += length_error + 2;
127	1.71k	}
128	1.71k	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	1.71k	snprintf_s(s, length + 1, "%s%s%s", (zip_error_string ? zip_error_string : ""), (zip_error_string ? ": " : ""), system_error_string);
134	1.71k	err->str = s;
135
136	1.71k	free(system_error_buffer);
137	1.71k	return s;
138	1.71k	}
139	7.51k	}

Coverage Report

Created: 2026-08-11 07:29