Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/CHECKSRC.md @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
children
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1 # checksrc
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3 This is the tool we use within the curl project to scan C source code and
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4 check that it adheres to our [Source Code Style guide](CODE_STYLE.md).
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6 ## Usage
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8 checksrc.pl [options] [file1] [file2] ...
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10 ## Command line options
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12 `-W[file]` whitelists that file and excludes it from being checked. Helpful
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13 when, for example, one of the files is generated.
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15 `-D[dir]` directory name to prepend to file names when accessing them.
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17 `-h` shows the help output, that also lists all recognized warnings
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19 ## What does checksrc warn for?
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21 checksrc does not check and verify the code against the entire style guide,
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22 but the script is instead an effort to detect the most common mistakes and
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23 syntax mistakes that contributors make before they get accustomed to our code
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24 style. Heck, many of us regulars do the mistakes too and this script helps us
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25 keep the code in shape.
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27 checksrc.pl -h
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29 Lists how to use the script and it lists all existing warnings it has and
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30 problems it detects. At the time of this writing, the existing checksrc
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31 warnings are:
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33 - `ASSIGNWITHINCONDITION`: Assignment within a conditional expression. The
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34 code style mandates the assignment to be done outside of it.
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36 - `ASTERISKNOSPACE`: A pointer was declared like `char* name` instead of the more
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37 appropriate `char *name` style. The asterisk should sit next to the name.
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39 - `ASTERISKSPACE`: A pointer was declared like `char * name` instead of the
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40 more appropriate `char *name` style. The asterisk should sit right next to
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41 the name without a space in between.
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43 - `BADCOMMAND`: There's a bad !checksrc! instruction in the code. See the
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44 **Ignore certain warnings** section below for details.
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46 - `BANNEDFUNC`: A banned function was used. The functions sprintf, vsprintf,
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47 strcat, strncat, gets are **never** allowed in curl source code.
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49 - `BRACEELSE`: '} else' on the same line. The else is supposed to be on the
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50 following line.
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52 - `BRACEPOS`: wrong position for an open brace (`{`).
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54 - `COMMANOSPACE`: a comma without following space
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56 - `COPYRIGHT`: the file is missing a copyright statement!
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58 - `CPPCOMMENTS`: `//` comment detected, that's not C89 compliant
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60 - `FOPENMODE`: `fopen()` needs a macro for the mode string, use it
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62 - `INDENTATION`: detected a wrong start column for code. Note that this
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63 warning only checks some specific places and will certainly miss many bad
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64 indentations.
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66 - `LONGLINE`: A line is longer than 79 columns.
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68 - `MULTISPACE`: Multiple spaces were found where only one should be used.
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70 - `NOSPACEEQUALS`: An equals sign was found without preceding space. We prefer
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71 `a = 2` and *not* `a=2`.
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73 - `OPENCOMMENT`: File ended with a comment (`/*`) still "open".
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75 - `PARENBRACE`: `){` was used without sufficient space in between.
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77 - `RETURNNOSPACE`: `return` was used without space between the keyword and the
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78 following value.
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80 - `SEMINOSPACE`: There was no space (or newline) following a semicolon.
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82 - `SIZEOFNOPAREN`: Found use of sizeof without parentheses. We prefer
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83 `sizeof(int)` style.
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85 - `SNPRINTF` - Found use of `snprintf()`. Since we use an internal replacement
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86 with a different return code etc, we prefer `msnprintf()`.
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88 - `SPACEAFTERPAREN`: there was a space after open parenthesis, `( text`.
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90 - `SPACEBEFORECLOSE`: there was a space before a close parenthesis, `text )`.
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92 - `SPACEBEFORECOMMA`: there was a space before a comma, `one , two`.
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94 - `SPACEBEFOREPAREN`: there was a space before an open parenthesis, `if (`,
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95 where one was not expected
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97 - `SPACESEMICOLON`: there was a space before semicolon, ` ;`.
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99 - `TABS`: TAB characters are not allowed!
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100
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101 - `TRAILINGSPACE`: Trailing white space on the line
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102
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103 - `UNUSEDIGNORE`: a checksrc inlined warning ignore was asked for but not used,
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104 that's an ignore that should be removed or changed to get used.
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105
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106 ### Extended warnings
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107
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108 Some warnings are quite computationally expensive to perform, so they are
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109 turned off by default. To enable these warnings, place a `.checksrc` file in
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110 the directory where they should be activated with commands to enable the
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111 warnings you are interested in. The format of the file is to enable one
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112 warning per line like so: `enable <EXTENDEDWARNING>`
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113
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114 Currently there is one extended warning which can be enabled:
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115
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116 - `COPYRIGHTYEAR`: the current changeset hasn't updated the copyright year in
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117 the source file
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118
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119 ## Ignore certain warnings
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120
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121 Due to the nature of the source code and the flaws of the checksrc tool, there
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122 is sometimes a need to ignore specific warnings. checksrc allows a few
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123 different ways to do this.
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124
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125 ### Inline ignore
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126
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127 You can control what to ignore within a specific source file by providing
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128 instructions to checksrc in the source code itself. You need a magic marker
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129 that is `!checksrc!` followed by the instruction. The instruction can ask to
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130 ignore a specific warning N number of times or you ignore all of them until
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131 you mark the end of the ignored section.
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132
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133 Inline ignores are only done for that single specific source code file.
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134
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135 Example
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136
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137 /* !checksrc! disable LONGLINE all */
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138
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139 This will ignore the warning for overly long lines until it is re-enabled with:
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140
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141 /* !checksrc! enable LONGLINE */
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142
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143 If the enabling isn't performed before the end of the file, it will be enabled
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144 automatically for the next file.
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145
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146 You can also opt to ignore just N violations so that if you have a single long
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147 line you just can't shorten and is agreed to be fine anyway:
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148
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149 /* !checksrc! disable LONGLINE 1 */
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150
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151 ... and the warning for long lines will be enabled again automatically after
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152 it has ignored that single warning. The number `1` can of course be changed to
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153 any other integer number. It can be used to make sure only the exact intended
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154 instances are ignored and nothing extra.
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155
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156 ### Directory wide ignore patterns
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157
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158 This is a method we've transitioned away from. Use inline ignores as far as
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159 possible.
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160
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161 Make a `checksrc.whitelist` file in the directory of the source code with the
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162 false positive, and include the full offending line into this file.