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annotate packages/infra/current/src/memset.c @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children
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1 /*===========================================================================
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2 //
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3 // memset.c
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4 //
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5 // ANSI standard memset() routine
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6 //
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7 //==========================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
0
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): jlarmour
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44 // Contributors: jlarmour
0
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45 // Date: 1998-06-04
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46 // Purpose: This file implements the ANSI memset() function
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47 // Description: This file implements the memset() function defined in ANSI para
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48 // 7.11.6.1. This is implemented in the kernel rather than the
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49 // C library due to it being required by gcc whether or not the
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50 // C library has been configured in.
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51 //
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52 //####DESCRIPTIONEND####
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53 //
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54 //==========================================================================*/
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55
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56
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57 /* INCLUDES */
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58
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59 #include <pkgconf/infra.h> /* Configuration of infra package */
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60
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61 #include <cyg/infra/cyg_type.h> /* Common type definitions */
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62 #include <cyg/infra/cyg_trac.h> /* Tracing support */
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63 #include <cyg/infra/cyg_ass.h> /* Assertion support */
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64 #include <stddef.h> /* Compiler defns such as size_t, NULL etc. */
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65
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66 /* MACROS */
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67
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68 /* Nonzero if X is not aligned on a word boundary. */
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69 #define CYG_STR_UNALIGNED(X) ((CYG_WORD)(X) & (sizeof (CYG_WORD) - 1))
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70
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71 /* How many bytes are copied each iteration of the word copy loop in the
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72 * optimised string implementation
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73 */
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74 #define CYG_STR_OPT_LITTLEBLOCKSIZE (sizeof (CYG_WORD))
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75
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76 /* EXPORTED SYMBOLS */
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77
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78 externC void *
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79 memset( void *s, int c, size_t n ) __attribute__ ((weak, alias("_memset")));
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80
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81 /* FUNCTIONS */
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82
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83 void *
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84 _memset( void *s, int c, size_t n )
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85 {
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86 #if defined(CYGIMP_INFRA_PREFER_SMALL_TO_FAST_MEMSET) || defined(__OPTIMIZE_SIZE__)
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87 char *char_ptr = (char *)s;
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88
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89 #ifdef CYG_TRACING_FIXED
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90 CYG_REPORT_FUNCNAMETYPE( "_memset", "returning %08x" );
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91 CYG_REPORT_FUNCARG3( "s=%08x, c=%d, n=%d", s, c, n );
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92
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93 if (n != 0)
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94 {
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95 CYG_CHECK_DATA_PTR( char_ptr, "s is not a valid pointer!" );
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96 CYG_CHECK_DATA_PTR( (&char_ptr[n-1]), "s+n-1 is not a valid address!" );
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97 }
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98 #endif
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99
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100 while (n-- != 0)
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101 {
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102 *char_ptr++ = (char) c;
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103 }
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104
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105 #ifdef CYG_TRACING_FIXED
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106 CYG_REPORT_RETVAL( s );
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107 #endif
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108 return s;
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109 #else
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110 char *char_ptr = (char *)s;
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111 cyg_ucount8 count;
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112 CYG_WORD buffer;
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113 CYG_WORD *aligned_addr;
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114 char *unaligned_addr;
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115
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116 #ifdef CYG_TRACING_FIXED
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117 CYG_REPORT_FUNCNAMETYPE( "_memset", "returning %08x" );
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118 CYG_REPORT_FUNCARG3( "s=%08x, c=%d, n=%d", s, c, n );
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119
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120 if (n != 0)
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121 {
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122 CYG_CHECK_DATA_PTR( s, "s is not a valid pointer!" );
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123 CYG_CHECK_DATA_PTR( (char *)s+n-1, "s+n-1 is not a valid address!" );
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124 }
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125 #endif
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126
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127 if (n < sizeof(CYG_WORD) || CYG_STR_UNALIGNED (s))
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128 {
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129 while (n-- != 0)
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130 {
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131 *char_ptr++ = (char) c;
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132 }
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133 #ifdef CYG_TRACING_FIXED
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134 CYG_REPORT_RETVAL( s );
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135 #endif
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136 return s;
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137 }
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138
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139 /* If we get this far, we know that n is large and s is word-aligned. */
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140
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141 aligned_addr = (CYG_WORD *)s;
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142
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143 /* Store C into each char sized location in BUFFER so that
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144 * we can set large blocks quickly.
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145 */
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146 c &= 0xff;
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147 if (CYG_STR_OPT_LITTLEBLOCKSIZE == 4)
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148 {
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149 buffer = (c << 8) | c;
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150 buffer |= (buffer << 16);
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151 }
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152 else
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153 {
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154 buffer = 0;
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155 for (count = 0; count < CYG_STR_OPT_LITTLEBLOCKSIZE; count++)
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156 buffer = (buffer << 8) | c;
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157 }
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158
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159 while (n >= CYG_STR_OPT_LITTLEBLOCKSIZE*4)
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160 {
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161 *aligned_addr++ = buffer;
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162 *aligned_addr++ = buffer;
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163 *aligned_addr++ = buffer;
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164 *aligned_addr++ = buffer;
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165 n -= 4*CYG_STR_OPT_LITTLEBLOCKSIZE;
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166 }
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167
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168 while (n >= CYG_STR_OPT_LITTLEBLOCKSIZE)
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169 {
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170 *aligned_addr++ = buffer;
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171 n -= CYG_STR_OPT_LITTLEBLOCKSIZE;
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172 }
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173
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174 /* Pick up the remainder with a bytewise loop. */
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175 unaligned_addr = (char*)aligned_addr;
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176 while (n)
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177 {
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178 *unaligned_addr++ = (char)c;
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179 n--;
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180 }
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181
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182 #ifdef CYG_TRACING_FIXED
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183 CYG_REPORT_RETVAL( s );
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184 #endif
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185 return s;
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186 #endif /* not defined(CYGIMP_PREFER_SMALL_TO_FAST_MEMSET) ||
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187 * defined(__OPTIMIZE_SIZE__) */
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188 } /* _memset() */
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189
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190 /* EOF memset.c */