Re: Buffer contents well-defined after fgets() reaches EOF ?

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Sujet : Re: Buffer contents well-defined after fgets() reaches EOF ?
De : 643-408-1753 (at) *nospam* kylheku.com (Kaz Kylheku)
Groupes : comp.lang.c
Date : 16. Feb 2025, 08:37:09
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <20250215233538.938@kylheku.com>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14
User-Agent : slrn/pre1.0.4-9 (Linux)
On 2025-02-16, James Kuyper <jameskuyper@alumni.caltech.edu> wrote:
No. What makes strtok() problematic can come up without any use of
threads. Consider for the moment a bug I had to investigate. A function
that was looping through strtok() calls to parse a string called a
utility function during each pass through the loop. The utility function
also called strtok() in a loop to parse an entirely different string for
a different purpose. Exercise for the student: figure out what the
consequences were.

Moreover, if strtok is thread-safe thanks to using thread-specific
storage for the context, that will not make it recursion-safe.  It will
make the bug behave predictably for the same inputs, no matter how other
threads use strtok.

--
TXR Programming Language: http://nongnu.org/txr
Cygnal: Cygwin Native Application Library: http://kylheku.com/cygnal
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Date Sujet#  Auteur
9 Feb 25 * Buffer contents well-defined after fgets() reaches EOF ?83Janis Papanagnou
9 Feb 25 +- Re: Buffer contents well-defined after fgets() reaches EOF ?1Kaz Kylheku
9 Feb 25 +* Re: Buffer contents well-defined after fgets() reaches EOF ?79Andrey Tarasevich
9 Feb 25 i+* Re: Buffer contents well-defined after fgets() reaches EOF ?61Andrey Tarasevich
10 Feb 25 ii`* Re: Buffer contents well-defined after fgets() reaches EOF ?60Lawrence D'Oliveiro
10 Feb 25 ii `* Re: Buffer contents well-defined after fgets() reaches EOF ?59Andrey Tarasevich
10 Feb 25 ii  +* Re: Buffer contents well-defined after fgets() reaches EOF ?37Andrey Tarasevich
10 Feb 25 ii  i+* Re: Buffer contents well-defined after fgets() reaches EOF ?35Michael S
13 Feb 25 ii  ii`* Re: Buffer contents well-defined after fgets() reaches EOF ?34Tim Rentsch
14 Feb 25 ii  ii `* Re: Buffer contents well-defined after fgets() reaches EOF ?33Michael S
14 Feb 25 ii  ii  +* Re: Buffer contents well-defined after fgets() reaches EOF ?2Michael S
14 Feb 25 ii  ii  i`- Re: Buffer contents well-defined after fgets() reaches EOF ?1Kaz Kylheku
14 Feb 25 ii  ii  +* Re: Buffer contents well-defined after fgets() reaches EOF ?21Kaz Kylheku
14 Feb 25 ii  ii  i+* Re: Buffer contents well-defined after fgets() reaches EOF ?3Keith Thompson
14 Feb 25 ii  ii  ii`* Re: Buffer contents well-defined after fgets() reaches EOF ?2Kaz Kylheku
15 Feb 25 ii  ii  ii `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Michael S
14 Feb 25 ii  ii  i+* Re: Buffer contents well-defined after fgets() reaches EOF ?14Janis Papanagnou
15 Feb 25 ii  ii  ii+- Re: Buffer contents well-defined after fgets() reaches EOF ?1Michael S
15 Feb 25 ii  ii  ii`* Re: Buffer contents well-defined after fgets() reaches EOF ?12Michael S
16 Feb 25 ii  ii  ii +* Re: Buffer contents well-defined after fgets() reaches EOF ?7Janis Papanagnou
16 Feb 25 ii  ii  ii i+* Re: Buffer contents well-defined after fgets() reaches EOF ?3James Kuyper
16 Feb 25 ii  ii  ii ii+- Re: Buffer contents well-defined after fgets() reaches EOF ?1Kaz Kylheku
16 Feb 25 ii  ii  ii ii`- Re: Buffer contents well-defined after fgets() reaches EOF ?1Janis Papanagnou
16 Feb 25 ii  ii  ii i`* Re: Buffer contents well-defined after fgets() reaches EOF ?3Michael S
16 Feb 25 ii  ii  ii i `* Re: Buffer contents well-defined after fgets() reaches EOF ?2Janis Papanagnou
17 Feb 25 ii  ii  ii i  `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Michael S
16 Feb 25 ii  ii  ii `* Re: Buffer contents well-defined after fgets() reaches EOF ?4Kaz Kylheku
16 Feb 25 ii  ii  ii  +* Re: Buffer contents well-defined after fgets() reaches EOF ?2Michael S
16 Feb 25 ii  ii  ii  i`- Re: Buffer contents well-defined after fgets() reaches EOF ?1Janis Papanagnou
16 Feb 25 ii  ii  ii  `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Janis Papanagnou
15 Feb 25 ii  ii  i+- Re: Buffer contents well-defined after fgets() reaches EOF ?1Michael S
15 Feb 25 ii  ii  i`* Re: Buffer contents well-defined after fgets() reaches EOF ?2Michael S
16 Feb 25 ii  ii  i `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Janis Papanagnou
14 Feb 25 ii  ii  +* Re: Buffer contents well-defined after fgets() reaches EOF ?5Janis Papanagnou
14 Feb 25 ii  ii  i`* Re: Buffer contents well-defined after fgets() reaches EOF ?4James Kuyper
14 Feb 25 ii  ii  i `* Re: Buffer contents well-defined after fgets() reaches EOF ?3Janis Papanagnou
15 Feb 25 ii  ii  i  `* Re: Buffer contents well-defined after fgets() reaches EOF ?2Michael S
16 Feb 25 ii  ii  i   `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Janis Papanagnou
15 Feb 25 ii  ii  +* Re: Buffer contents well-defined after fgets() reaches EOF ?3Tim Rentsch
15 Feb 25 ii  ii  i`* Re: Buffer contents well-defined after fgets() reaches EOF ?2Michael S
19 Feb 25 ii  ii  i `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Tim Rentsch
21 Feb 25 ii  ii  `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Lawrence D'Oliveiro
15 Feb 25 ii  i`- Re: Buffer contents well-defined after fgets() reaches EOF ?1Tim Rentsch
10 Feb 25 ii  +- Re: Buffer contents well-defined after fgets() reaches EOF ?1Janis Papanagnou
10 Feb 25 ii  `* Re: Buffer contents well-defined after fgets() reaches EOF ?20Lawrence D'Oliveiro
10 Feb 25 ii   `* Re: Buffer contents well-defined after fgets() reaches EOF ?19Andrey Tarasevich
10 Feb 25 ii    `* Re: Buffer contents well-defined after fgets() reaches EOF ?18Lawrence D'Oliveiro
10 Feb 25 ii     `* Re: Buffer contents well-defined after fgets() reaches EOF ?17James Kuyper
11 Feb 25 ii      `* Re: Buffer contents well-defined after fgets() reaches EOF ?16Lawrence D'Oliveiro
11 Feb 25 ii       +* Re: Buffer contents well-defined after fgets() reaches EOF ?11James Kuyper
11 Feb 25 ii       i+- Re: Buffer contents well-defined after fgets() reaches EOF ?1Kaz Kylheku
11 Feb 25 ii       i`* Re: Buffer contents well-defined after fgets() reaches EOF ?9Lawrence D'Oliveiro
11 Feb 25 ii       i `* Re: Buffer contents well-defined after fgets() reaches EOF ?8James Kuyper
11 Feb 25 ii       i  +* Re: Buffer contents well-defined after fgets() reaches EOF ?3Lawrence D'Oliveiro
11 Feb 25 ii       i  i`* Re: Buffer contents well-defined after fgets() reaches EOF ?2James Kuyper
12 Feb 25 ii       i  i `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Lawrence D'Oliveiro
11 Feb 25 ii       i  `* Re: Buffer contents well-defined after fgets() reaches EOF ?4Keith Thompson
11 Feb 25 ii       i   `* Re: Buffer contents well-defined after fgets() reaches EOF ?3James Kuyper
12 Feb 25 ii       i    `* Re: Buffer contents well-defined after fgets() reaches EOF ?2Keith Thompson
18 Feb 25 ii       i     `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Tim Rentsch
11 Feb 25 ii       `* Re: Buffer contents well-defined after fgets() reaches EOF ?4Andrey Tarasevich
11 Feb 25 ii        +- Re: Buffer contents well-defined after fgets() reaches EOF ?1Andrey Tarasevich
11 Feb 25 ii        +- Re: Buffer contents well-defined after fgets() reaches EOF ?1Kaz Kylheku
13 Feb 25 ii        `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Tim Rentsch
9 Feb 25 i`* Re: Buffer contents well-defined after fgets() reaches EOF ?17Janis Papanagnou
9 Feb 25 i +* Re: Buffer contents well-defined after fgets() reaches EOF ?3Michael S
9 Feb 25 i i`* Re: Buffer contents well-defined after fgets() reaches EOF ?2Janis Papanagnou
10 Feb 25 i i `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Mark Bourne
9 Feb 25 i +* Re: Buffer contents well-defined after fgets() reaches EOF ?11Andrey Tarasevich
9 Feb 25 i i`* Re: Buffer contents well-defined after fgets() reaches EOF ?10Janis Papanagnou
10 Feb 25 i i `* Re: Buffer contents well-defined after fgets() reaches EOF ?9Keith Thompson
10 Feb 25 i i  `* Re: Buffer contents well-defined after fgets() reaches EOF ?8Janis Papanagnou
10 Feb 25 i i   `* Re: Buffer contents well-defined after fgets() reaches EOF ?7Keith Thompson
10 Feb 25 i i    `* Re: Buffer contents well-defined after fgets() reaches EOF ?6Janis Papanagnou
10 Feb 25 i i     `* Re: Buffer contents well-defined after fgets() reaches EOF ?5Keith Thompson
10 Feb 25 i i      +* Re: Buffer contents well-defined after fgets() reaches EOF ?3Janis Papanagnou
11 Feb 25 i i      i+- Re: Buffer contents well-defined after fgets() reaches EOF ?1Mark Bourne
11 Feb 25 i i      i`- Re: Buffer contents well-defined after fgets() reaches EOF ?1Kaz Kylheku
17 Feb 25 i i      `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Lawrence D'Oliveiro
10 Feb 25 i `* Re: Buffer contents well-defined after fgets() reaches EOF ?2Mark Bourne
11 Feb 25 i  `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Mark Bourne
10 Feb 25 `* Re: Buffer contents well-defined after fgets() reaches EOF ?2Ben Bacarisse
10 Feb 25  `- Re: Buffer contents well-defined after fgets() reaches EOF ?1Janis Papanagnou

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