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<h1>copy.c</h1><a href="copy_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="preprocessor">#ifndef _COPY_C_ </span><span class="comment">/* -*- linux-c -*- */</span>
00002 <span class="preprocessor">#define _COPY_C_</span>
00003 <span class="preprocessor"></span>
00004 <span class="preprocessor">#include "<a class="code" href="string_8c.html">string.c</a>"</span>
00005 <span class="comment"></span>
00006 <span class="comment">/** @file copy.c</span>
00007 <span class="comment"> * @brief Functions to copy from user space.</span>
00008 <span class="comment"> */</span>
00009 <span class="comment"></span>
00010 <span class="comment">/** @addtogroup copy Functions to copy from user space.</span>
00011 <span class="comment"> * Functions to copy from user space.</span>
00012 <span class="comment"> * None of these functions will sleep (for example to allow pages</span>
00013 <span class="comment"> * to be swapped in). It is possible (although rare) that the data</span>
00014 <span class="comment"> * in user space will not present and these functions will return an error.</span>
00015 <span class="comment"> * @{</span>
00016 <span class="comment"> */</span>
00017
00018 <span class="keywordtype">long</span> <a class="code" href="group__copy.html#ga0">_stp_strncpy_from_user</a>(<span class="keywordtype">char</span> *dst, <span class="keyword">const</span> <span class="keywordtype">char</span> __user *src, <span class="keywordtype">long</span> count);
00019 <span class="comment">//static long __stp_strncpy_from_user(char *dst, const char __user *src, long count);</span>
00020
00021 <span class="preprocessor">#if defined (__i386__)</span>
00022 <span class="preprocessor"></span><span class="preprocessor">#define __stp_strncpy_from_user(dst,src,count,res) \</span>
00023 <span class="preprocessor">do { \</span>
00024 <span class="preprocessor"> int __d0, __d1, __d2; \</span>
00025 <span class="preprocessor"> __asm__ __volatile__( \</span>
00026 <span class="preprocessor"> " testl %1,%1\n" \</span>
00027 <span class="preprocessor"> " jz 2f\n" \</span>
00028 <span class="preprocessor"> "0: lodsb\n" \</span>
00029 <span class="preprocessor"> " stosb\n" \</span>
00030 <span class="preprocessor"> " testb %%al,%%al\n" \</span>
00031 <span class="preprocessor"> " jz 1f\n" \</span>
00032 <span class="preprocessor"> " decl %1\n" \</span>
00033 <span class="preprocessor"> " jnz 0b\n" \</span>
00034 <span class="preprocessor"> "1: subl %1,%0\n" \</span>
00035 <span class="preprocessor"> "2:\n" \</span>
00036 <span class="preprocessor"> ".section .fixup,\"ax\"\n" \</span>
00037 <span class="preprocessor"> "3: movl %5,%0\n" \</span>
00038 <span class="preprocessor"> " jmp 2b\n" \</span>
00039 <span class="preprocessor"> ".previous\n" \</span>
00040 <span class="preprocessor"> ".section __ex_table,\"a\"\n" \</span>
00041 <span class="preprocessor"> " .align 4\n" \</span>
00042 <span class="preprocessor"> " .long 0b,3b\n" \</span>
00043 <span class="preprocessor"> ".previous" \</span>
00044 <span class="preprocessor"> : "=d"(res), "=c"(count), "=&a" (__d0), "=&S" (__d1), \</span>
00045 <span class="preprocessor"> "=&D" (__d2) \</span>
00046 <span class="preprocessor"> : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \</span>
00047 <span class="preprocessor"> : "memory"); \</span>
00048 <span class="preprocessor">} while (0)</span>
00049 <span class="preprocessor"></span><span class="preprocessor">#elif defined (__x86_64__)</span>
00050 <span class="preprocessor"></span><span class="preprocessor">#define __stp_strncpy_from_user(dst,src,count,res) \</span>
00051 <span class="preprocessor">do { \</span>
00052 <span class="preprocessor"> long __d0, __d1, __d2; \</span>
00053 <span class="preprocessor"> __asm__ __volatile__( \</span>
00054 <span class="preprocessor"> " testq %1,%1\n" \</span>
00055 <span class="preprocessor"> " jz 2f\n" \</span>
00056 <span class="preprocessor"> "0: lodsb\n" \</span>
00057 <span class="preprocessor"> " stosb\n" \</span>
00058 <span class="preprocessor"> " testb %%al,%%al\n" \</span>
00059 <span class="preprocessor"> " jz 1f\n" \</span>
00060 <span class="preprocessor"> " decq %1\n" \</span>
00061 <span class="preprocessor"> " jnz 0b\n" \</span>
00062 <span class="preprocessor"> "1: subq %1,%0\n" \</span>
00063 <span class="preprocessor"> "2:\n" \</span>
00064 <span class="preprocessor"> ".section .fixup,\"ax\"\n" \</span>
00065 <span class="preprocessor"> "3: movq %5,%0\n" \</span>
00066 <span class="preprocessor"> " jmp 2b\n" \</span>
00067 <span class="preprocessor"> ".previous\n" \</span>
00068 <span class="preprocessor"> ".section __ex_table,\"a\"\n" \</span>
00069 <span class="preprocessor"> " .align 8\n" \</span>
00070 <span class="preprocessor"> " .quad 0b,3b\n" \</span>
00071 <span class="preprocessor"> ".previous" \</span>
00072 <span class="preprocessor"> : "=r"(res), "=c"(count), "=&a" (__d0), "=&S" (__d1), \</span>
00073 <span class="preprocessor"> "=&D" (__d2) \</span>
00074 <span class="preprocessor"> : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \</span>
00075 <span class="preprocessor"> : "memory"); \</span>
00076 <span class="preprocessor">} while (0)</span>
00077 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00078 <span class="preprocessor"></span><span class="comment"></span>
00079 <span class="comment">/** Copy a NULL-terminated string from userspace.</span>
00080 <span class="comment"> * On success, returns the length of the string (not including the trailing</span>
00081 <span class="comment"> * NULL).</span>
00082 <span class="comment"> *</span>
00083 <span class="comment"> * If access to userspace fails, returns -EFAULT (some data may have been</span>
00084 <span class="comment"> * copied).</span>
00085 <span class="comment"> * @param dst Destination address, in kernel space. This buffer must be at</span>
00086 <span class="comment"> * least <i>count</i> bytes long.</span>
00087 <span class="comment"> * @param src Source address, in user space.</span>
00088 <span class="comment"> * @param count Maximum number of bytes to copy, including the trailing NULL.</span>
00089 <span class="comment"> * </span>
00090 <span class="comment"> * If <i>count</i> is smaller than the length of the string, copies </span>
00091 <span class="comment"> * <i>count</i> bytes and returns <i>count</i>.</span>
00092 <span class="comment"> * @deprecated I can't think of why you wouldn't use _stp_string_from_user() instead.</span>
00093 <span class="comment"> */</span>
00094
00095 <span class="keywordtype">long</span>
<a name="l00096"></a><a class="code" href="group__copy.html#ga0">00096</a> <a class="code" href="group__copy.html#ga0">_stp_strncpy_from_user</a>(<span class="keywordtype">char</span> *dst, <span class="keyword">const</span> <span class="keywordtype">char</span> __user *src, <span class="keywordtype">long</span> count)
00097 {
00098 <span class="keywordtype">long</span> res;
00099 __stp_strncpy_from_user(dst, src, count, res);
00100 <span class="keywordflow">return</span> res;
00101 }
00102 <span class="comment"></span>
00103 <span class="comment">/** Copy a String from userspace.</span>
00104 <span class="comment"> * Copies a string of up to \e count bytes from userspace into a String. </span>
00105 <span class="comment"> * If access to userspace fails, returns -EFAULT (some data may have been</span>
00106 <span class="comment"> * copied).</span>
00107 <span class="comment"> * @param str Destination String.</span>
00108 <span class="comment"> * @param src Source address, in user space.</span>
00109 <span class="comment"> * @param count Maximum number of bytes to copy, including the trailing NULL.</span>
00110 <span class="comment"> * </span>
00111 <span class="comment"> */</span>
00112
<a name="l00113"></a><a class="code" href="group__copy.html#ga1">00113</a> <span class="keywordtype">void</span> <a class="code" href="group__copy.html#ga1">_stp_string_from_user</a> (String str, <span class="keyword">const</span> <span class="keywordtype">char</span> __user *src, <span class="keywordtype">long</span> count)
00114 {
00115 <span class="keywordtype">long</span> res;
00116 <span class="keywordflow">if</span> (count > <a class="code" href="group__string.html#ga8">STP_STRING_SIZE</a> - str->len - 1)
00117 count = <a class="code" href="group__string.html#ga8">STP_STRING_SIZE</a> - str->len - 1;
00118 __stp_strncpy_from_user(str->buf + str->len, src, count, res);
00119 <span class="keywordflow">if</span> (res > 0) {
00120 str->len += res;
00121 str->buf[str->len] = <span class="charliteral">'\0'</span>;
00122 }
00123 }
00124 <span class="comment"></span>
00125 <span class="comment">/** Copy a block of data from user space.</span>
00126 <span class="comment"> *</span>
00127 <span class="comment"> * If some data could not be copied, this function will pad the copied</span>
00128 <span class="comment"> * data to the requested size using zero bytes.</span>
00129 <span class="comment"></span>
00130 <span class="comment"> * @param dst Destination address, in kernel space.</span>
00131 <span class="comment"> * @param src Source address, in user space.</span>
00132 <span class="comment"> * @param count Number of bytes to copy.</span>
00133 <span class="comment"> * @return number of bytes that could not be copied. On success, </span>
00134 <span class="comment"> * this will be zero.</span>
00135 <span class="comment"> *</span>
00136 <span class="comment"> */</span>
00137
00138 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span>
<a name="l00139"></a><a class="code" href="group__copy.html#ga2">00139</a> <a class="code" href="group__copy.html#ga2">_stp_copy_from_user</a> (<span class="keywordtype">char</span> *dst, <span class="keyword">const</span> <span class="keywordtype">char</span> __user *src, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> count)
00140 {
00141 <span class="keywordflow">return</span> __copy_from_user_inatomic(dst, src, count);
00142 }
00143 <span class="comment"></span>
00144 <span class="comment">/** Copy an argv from user space to a List.</span>
00145 <span class="comment"> *</span>
00146 <span class="comment"> * @param list A list.</span>
00147 <span class="comment"> * @param argv Source argv, in user space.</span>
00148 <span class="comment"> * @return number of elements in <i>list</i></span>
00149 <span class="comment"> *</span>
00150 <span class="comment"> * @b Example:</span>
00151 <span class="comment"> * @include argv.c</span>
00152 <span class="comment"> */</span>
00153
<a name="l00154"></a><a class="code" href="group__copy.html#ga3">00154</a> <span class="keywordtype">int</span> <a class="code" href="group__copy.html#ga3">_stp_copy_argv_from_user</a> (<a class="code" href="group__maps.html#ga1">MAP</a> list, <span class="keywordtype">char</span> __user *__user *argv)
00155 {
00156 <span class="keywordtype">char</span> str[128];
00157 <span class="keywordtype">char</span> __user *vstr;
00158 <span class="keywordtype">int</span> len;
00159
00160 <span class="keywordflow">if</span> (argv)
00161 argv++;
00162
00163 <span class="keywordflow">while</span> (argv != NULL) {
00164 <span class="keywordflow">if</span> (get_user (vstr, argv))
00165 <span class="keywordflow">break</span>;
00166
00167 <span class="keywordflow">if</span> (vstr == NULL)
00168 <span class="keywordflow">break</span>;
00169
00170 len = <a class="code" href="group__copy.html#ga0">_stp_strncpy_from_user</a>(str, vstr, 128);
00171 str[len] = 0;
00172 <a class="code" href="group__lists.html#ga2">_stp_list_add_str</a> (list, str);
00173 argv++;
00174 }
00175 <span class="keywordflow">return</span> list->num;
00176 }<span class="comment"></span>
00177 <span class="comment">/** @} */</span>
00178 <span class="preprocessor">#endif </span><span class="comment">/* _COPY_C_ */</span>
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