annotate buf_sub.3 @ 25:fc82452912d0

misc: added signature for changeset dddf94a30fa1
author David Demelier <markand@malikania.fr>
date Thu, 16 Sep 2021 13:59:56 +0200
parents d87e84936795
children dbdc17e11648
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1 .\"
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2 .\" buf_sub.3 -- simple string buffer for C
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3 .\"
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4 .\" Copyright (c) 2019-2021 David Demelier <markand@malikania.fr>
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5 .\"
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6 .\" Permission to use, copy, modify, and/or distribute this software for any
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7 .\" purpose with or without fee is hereby granted, provided that the above
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8 .\" copyright notice and this permission notice appear in all copies.
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9 .\"
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10 .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 .\"
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18 .Dd October 29, 2019-2021
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19 .Dt BUF_SUB 3
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20 .Os
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21 .\" NAME
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22 .Sh NAME
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23 .Nm buf_sub
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24 .Nd duplicate a specific portion from the buffer
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25 .\" SYNOPSIS
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26 .Sh SYNOPSIS
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27 .In buf.h
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28 .Ft int
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29 .Fn buf_sub "struct buf *b" "const struct buf *src" "size_t pos" "size_t count"
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30 .\" DESCRIPTION
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31 .Sh DESCRIPTION
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32 Extract the portion at position
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33 .Fa pos
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34 from the buffer specified by
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35 .Fa src
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36 with
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37 .Fa count
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38 number of characters and set to
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39 .Fa b .
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40 .Pp
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41 This function will first initialize and allocate the buffer specified by
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42 .Fa b
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43 to fill the portion length.
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44 It should not contain any data because it will be overwritten.
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45 .Pp
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46 The
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47 .Fa count
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48 argument can be set to -1 to extract data until the end of the
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49 .Fa src
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50 buffer.
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51 .Pp
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52 Undefined behavior may occur if the
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53 .Fa pos
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54 argument is outside of the buffer bounds.
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55 .\" RETURN VALUE
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56 .Sh RETURN VALUE
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57 The
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58 .Fn buf_sub
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59 function returns -1 in case of error and
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60 .Va errno
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61 is set to indicate the error.
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62 .\" ERRORS
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63 .Sh ERRORS
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64 .Bl -tag -width Er
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65 .It Bq Er ENOMEM
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66 Memory allocation failed.
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67 .El
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68 .\" SEE ALSO
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69 .Sh SEE ALSO
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70 .Xr libbuf 3
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71 .\" AUTHORS
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72 .Sh AUTHORS
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73 The
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74 .Nm libbuf
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75 library was written by
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76 .An David Demelier <markand@malikania.fr>