[kvm-unit-tests PATCH v2 21/24] lib: Add strcasecmp and strncasecmp

[Eric Auger]

On 1/26/24 15:23, Andrew Jones wrote:
> We'll soon want a case insensitive string comparison. Add toupper()
> and tolower() too (the latter gets used by the new string functions).
>
> Signed-off-by: Andrew Jones <andrew.jones at linux.dev>
> Reviewed-by: Thomas Huth <thuth at redhat.com>
> Acked-by: Thomas Huth <thuth at redhat.com>
Reviewed-by: Eric Auger <eric.auger at redhat.com>

Eric
> ---
>  lib/ctype.h  | 10 ++++++++++
>  lib/string.c | 14 ++++++++++++++
>  lib/string.h |  2 ++
>  3 files changed, 26 insertions(+)
>
> diff --git a/lib/ctype.h b/lib/ctype.h
> index 48a9c16300f8..45c96f111e19 100644
> --- a/lib/ctype.h
> +++ b/lib/ctype.h
> @@ -37,4 +37,14 @@ static inline int isspace(int c)
>          return c == ' ' || c == '\t' || c == '\r' || c == '\n' || c == '\v' || c == '\f';
>  }
>  
> +static inline int toupper(int c)
> +{
> +	return islower(c) ? c - 'a' + 'A' : c;
> +}
> +
> +static inline int tolower(int c)
> +{
> +	return isupper(c) ? c - 'A' + 'a' : c;
> +}
> +
>  #endif /* _CTYPE_H_ */
> diff --git a/lib/string.c b/lib/string.c
> index 6d8a6380db92..ab6a724a3144 100644
> --- a/lib/string.c
> +++ b/lib/string.c
> @@ -54,11 +54,25 @@ int strncmp(const char *a, const char *b, size_t n)
>  	return 0;
>  }
>  
> +int strncasecmp(const char *a, const char *b, size_t n)
> +{
> +	for (; n--; ++a, ++b)
> +		if (tolower(*a) != tolower(*b) || *a == '\0')
> +			return tolower(*a) - tolower(*b);
> +
> +	return 0;
> +}
> +
>  int strcmp(const char *a, const char *b)
>  {
>  	return strncmp(a, b, SIZE_MAX);
>  }
>  
> +int strcasecmp(const char *a, const char *b)
> +{
> +	return strncasecmp(a, b, SIZE_MAX);
> +}
> +
>  char *strchr(const char *s, int c)
>  {
>  	while (*s != (char)c)
> diff --git a/lib/string.h b/lib/string.h
> index 758dca8af36a..a28d75641530 100644
> --- a/lib/string.h
> +++ b/lib/string.h
> @@ -15,6 +15,8 @@ extern char *strcat(char *dest, const char *src);
>  extern char *strcpy(char *dest, const char *src);
>  extern int strcmp(const char *a, const char *b);
>  extern int strncmp(const char *a, const char *b, size_t n);
> +int strcasecmp(const char *a, const char *b);
> +int strncasecmp(const char *a, const char *b, size_t n);
>  extern char *strchr(const char *s, int c);
>  extern char *strrchr(const char *s, int c);
>  extern char *strchrnul(const char *s, int c);