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libc: minimal: add missing ctype.h functions #99451

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libc: minimal: add missing ctype.h functions #99451

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15 changes: 15 additions & 0 deletions lib/libc/minimal/include/ctype.h
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,11 @@
return (int)((((unsigned)c|32u)-(unsigned)'a') < 26U);
}

static inline int isblank(int c)
{
return (int)((c == (int)' ') || (c == (int)'\t'));
}

static inline int isspace(int c)
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@keith-packard keith-packard Nov 15, 2025

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I'd let the compiler do something cute if it likes, but express these in a direct fashion.

static inline int isspace (int c)
{
    return c == ' ' || ('\t' <= c && c <= '\r');
}

Similarly for the other functions. There's no reason to obscure what these functions do; having to check that there are 5 'blank' values between '\t' and '\r' is something the compiler should do, not us.

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@cfriedt cfriedt Nov 16, 2025

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I'll prepend a commit for that, since it's technically not related to the bugfix.

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@cfriedt cfriedt Nov 16, 2025

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I could also prepend a commit that would eliminate linter issues as well (and fix up the commit I added).

{
return (int)(c == (int)' ' || ((unsigned)c-(unsigned)'\t') < 5U);
Expand All @@ -45,6 +50,11 @@
return (int)(((unsigned)(a)-(unsigned)'0') < 10U);
}

static inline int islower(int c)
{
return (int)(((unsigned)(c) - (unsigned)'a') < 26U);

Check warning on line 55 in lib/libc/minimal/include/ctype.h

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UNSPECIFIED_INT 

lib/libc/minimal/include/ctype.h:55  Prefer 'unsigned int' to bare use of 'unsigned'

Check warning on line 55 in lib/libc/minimal/include/ctype.h

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GitHub Actions / Run compliance checks on patch series (PR)

UNSPECIFIED_INT 

lib/libc/minimal/include/ctype.h:55  Prefer 'unsigned int' to bare use of 'unsigned'

Check warning on line 55 in lib/libc/minimal/include/ctype.h

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GitHub Actions / Run compliance checks on patch series (PR)

UNSPECIFIED_INT 

lib/libc/minimal/include/ctype.h:55  Prefer 'unsigned int' to bare use of 'unsigned'

Check warning on line 55 in lib/libc/minimal/include/ctype.h

View workflow job for this annotation

GitHub Actions / Run compliance checks on patch series (PR)

UNSPECIFIED_INT 

lib/libc/minimal/include/ctype.h:55  Prefer 'unsigned int' to bare use of 'unsigned'

Check warning on line 55 in lib/libc/minimal/include/ctype.h

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GitHub Actions / Run compliance checks on patch series (PR)

UNSPECIFIED_INT 

lib/libc/minimal/include/ctype.h:55  Prefer 'unsigned int' to bare use of 'unsigned'

Check warning on line 55 in lib/libc/minimal/include/ctype.h

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GitHub Actions / Run compliance checks on patch series (PR)

UNSPECIFIED_INT 

lib/libc/minimal/include/ctype.h:55  Prefer 'unsigned int' to bare use of 'unsigned'
}

static inline int isxdigit(int a)
{
unsigned int ua = (unsigned int)a;
Expand All @@ -69,6 +79,11 @@
return (int)(isalpha(chr) || isdigit(chr));
}

static inline int ispunct(int c)
{
return (int)(isgraph(c) && !isalnum(c));
}

static inline int iscntrl(int c)
{
return (int)((((unsigned int)c) <= 31U) || (((unsigned int)c) == 127U));
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