libexplain  1.4.D001
libexplain/buffer/errno/lstat.c
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00001 /*
00002  * libexplain - Explain errno values returned by libc functions
00003  * Copyright (C) 2008-2011, 2013 Peter Miller
00004  * Written by Peter Miller <pmiller@opensource.org.au>
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU Lesser General Public License as published by
00008  * the Free Software Foundation; either version 3 of the License, or (at
00009  * your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public License
00017  * along with this program. If not, see <http://www.gnu.org/licenses/>.
00018  */
00019 
00020 #include <libexplain/ac/errno.h>
00021 #include <libexplain/ac/sys/stat.h>
00022 
00023 #include <libexplain/buffer/eacces.h>
00024 #include <libexplain/buffer/efault.h>
00025 #include <libexplain/buffer/eloop.h>
00026 #include <libexplain/buffer/enametoolong.h>
00027 #include <libexplain/buffer/enoent.h>
00028 #include <libexplain/buffer/enomem.h>
00029 #include <libexplain/buffer/enotdir.h>
00030 #include <libexplain/buffer/errno/generic.h>
00031 #include <libexplain/buffer/errno/lstat.h>
00032 #include <libexplain/buffer/errno/path_resolution.h>
00033 #include <libexplain/buffer/pathname.h>
00034 #include <libexplain/buffer/pointer.h>
00035 #include <libexplain/explanation.h>
00036 #include <libexplain/is_efault.h>
00037 #include <libexplain/string_buffer.h>
00038 
00039 
00040 static void
00041 explain_buffer_errno_lstat_system_call(explain_string_buffer_t *sb,
00042     int errnum, const char *pathname, const struct stat *data)
00043 {
00044     (void)errnum;
00045     explain_string_buffer_printf(sb, "lstat(pathname = ");
00046     explain_buffer_pathname(sb, pathname);
00047     explain_string_buffer_puts(sb, ", data = ");
00048     explain_buffer_pointer(sb, data);
00049     explain_string_buffer_putc(sb, ')');
00050 }
00051 
00052 
00053 void
00054 explain_buffer_errno_lstat_explanation(explain_string_buffer_t *sb,
00055     int errnum, const char *syscall_name, const char *pathname,
00056     const struct stat *data)
00057 {
00058     explain_final_t final_component;
00059 
00060     (void)data;
00061     explain_final_init(&final_component);
00062     final_component.follow_symlink = 0;
00063 
00064     switch (errnum)
00065     {
00066     case EACCES:
00067         explain_buffer_eacces(sb, pathname, "pathname", &final_component);
00068         break;
00069 
00070     case EFAULT:
00071         if (explain_is_efault_path(pathname))
00072         {
00073             explain_buffer_efault(sb, "pathname");
00074             break;
00075         }
00076         if (explain_is_efault_pointer(data, sizeof(*data)))
00077         {
00078             explain_buffer_efault(sb, "data");
00079             break;
00080         }
00081         break;
00082 
00083     case ELOOP:
00084     case EMLINK: /* BSD */
00085         explain_buffer_eloop(sb, pathname, "pathname", &final_component);
00086         break;
00087 
00088     case ENAMETOOLONG:
00089         explain_buffer_enametoolong
00090         (
00091             sb,
00092             pathname,
00093             "pathname",
00094             &final_component
00095         );
00096         break;
00097 
00098     case ENOENT:
00099         explain_buffer_enoent(sb, pathname, "pathname", &final_component);
00100         break;
00101 
00102     case ENOMEM:
00103         explain_buffer_enomem_kernel(sb);
00104         break;
00105 
00106     case ENOTDIR:
00107         explain_buffer_enotdir(sb, pathname, "pathname", &final_component);
00108         break;
00109 
00110     default:
00111         explain_buffer_errno_generic(sb, errnum, syscall_name);
00112         break;
00113     }
00114 }
00115 
00116 
00117 void
00118 explain_buffer_errno_lstat(explain_string_buffer_t *sb, int errnum,
00119     const char *pathname, const struct stat *data)
00120 {
00121     explain_explanation_t exp;
00122 
00123     explain_explanation_init(&exp, errnum);
00124     explain_buffer_errno_lstat_system_call
00125     (
00126         &exp.system_call_sb,
00127         errnum,
00128         pathname,
00129         data
00130     );
00131     explain_buffer_errno_lstat_explanation
00132     (
00133         &exp.explanation_sb,
00134         errnum,
00135         "lstat",
00136         pathname,
00137         data
00138     );
00139     explain_explanation_assemble(&exp, sb);
00140 }
00141 
00142 
00143 /* vim: set ts=8 sw=4 et : */