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1 //======================================================================== |
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2 // |
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3 // itoa.cxx |
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4 // |
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5 // FIXME |
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6 // |
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7 //======================================================================== |
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8 //####COPYRIGHTBEGIN#### |
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9 // |
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10 // ------------------------------------------- |
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11 // The contents of this file are subject to the Cygnus eCos Public License |
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12 // Version 1.0 (the "License"); you may not use this file except in |
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13 // compliance with the License. You may obtain a copy of the License at |
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14 // http://sourceware.cygnus.com/ecos |
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15 // |
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16 // Software distributed under the License is distributed on an "AS IS" |
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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18 // License for the specific language governing rights and limitations under |
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19 // the License. |
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20 // |
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21 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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22 // September 30, 1998. |
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23 // |
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24 // The Initial Developer of the Original Code is Cygnus. Portions created |
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25 // by Cygnus are Copyright (C) 1998,1999 Cygnus Solutions. All Rights Reserved. |
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26 // ------------------------------------------- |
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27 // |
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28 //####COPYRIGHTEND#### |
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29 //======================================================================== |
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30 //#####DESCRIPTIONBEGIN#### |
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31 // |
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32 // Author(s): jlarmour |
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33 // Contributors: jlarmour |
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34 // Date: 1999-03-17 |
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35 // Purpose: |
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36 // Description: |
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37 // Usage: |
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38 // |
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39 //####DESCRIPTIONEND#### |
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40 // |
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41 //======================================================================== |
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42 |
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43 // CONFIGURATION |
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44 |
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45 #include <pkgconf/libc.h> // C library configuration |
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46 |
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47 // INCLUDES |
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48 |
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49 #include <cyg/infra/cyg_type.h> // Common type definitions and support |
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50 #include <cyg/infra/cyg_ass.h> // Assertion infrastructure |
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51 #include <cyg/infra/cyg_trac.h> // Tracing infrastructure |
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52 #include <stdlib.h> // Header for this file |
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53 #include <string.h> // For memcpy() |
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54 |
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55 // FUNCTIONS |
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56 |
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57 ///////////////////// |
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58 // cyg_libc_itoa() // |
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59 ///////////////////// |
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60 // |
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61 // This converts num to a string and puts it into s padding with |
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62 // "0"'s if padzero is set, or spaces otherwise if necessary. |
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63 // The number of chars written to s is returned |
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64 // |
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65 |
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66 // This implementation is probably suboptimal in terms of performance |
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67 // but there wouldn't be much in it with only 11 chars max to convert :-/. |
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68 // Actually FIXME: what if someone passes a width >11 |
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69 |
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70 externC cyg_uint8 |
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71 cyg_libc_itoa( cyg_uint8 *s, cyg_int32 num, cyg_uint8 width, cyg_bool padzero ) |
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72 { |
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73 CYG_REPORT_FUNCNAMETYPE("cyg_libc_itoa", "returning %d"); |
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74 CYG_REPORT_FUNCARG4( "s=%08x, num=%d, width=%d, padzero=%d", |
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75 s, num, width, padzero ); |
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76 |
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77 CYG_CHECK_DATA_PTR(s, "input string not a valid pointer"); |
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78 |
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79 // special case for zero otherwise we'd have to treat it specially later |
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80 // on anyway |
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81 |
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82 if (num==0) { |
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83 cyg_ucount8 i; |
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84 |
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85 for (i=0; i<width; ++i) |
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86 s[i] = padzero ? '0' : ' '; |
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87 CYG_REPORT_RETVAL(i); |
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88 return i; |
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89 } |
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90 |
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91 // return value |
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92 cyg_uint8 ret=0; |
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93 |
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94 // Pre-fiddle for negative numbers |
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95 if ((num < 0) && (width > 0)) { |
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96 *s++ = '-'; |
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97 --width; |
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98 num = abs(num); |
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99 ++ret; |
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100 } |
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101 |
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102 cyg_ucount32 i; |
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103 cyg_bool reachednum = false; |
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104 cyg_uint8 c, j; |
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105 |
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106 // i starts off with factor of 10 digits - which is the string length |
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107 // of a positive 32-bit number |
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108 for (i=1000000000, j=10; i>0; i/=10, --j) { |
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109 c = (num / i); |
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110 |
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111 if (!reachednum && c==0) { |
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112 if (j <= width) { |
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113 *s++ = padzero ? '0' : ' '; |
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114 ++ret; |
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115 } |
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116 } // if |
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117 else { |
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118 *s++ = c + '0'; |
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119 ++ret; |
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120 reachednum = true; |
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121 } |
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122 num %= i; |
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123 } // for |
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124 |
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125 CYG_POSTCONDITION(ret >= width, "Didn't output enough chars!"); |
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126 |
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127 CYG_REPORT_RETVAL(ret); |
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128 return ret; |
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129 } // cyg_libc_itoa() |
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130 |
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131 // EOF itoa.cxx |
