Re: [Xen-devel] [PATCH v6 for-4.5 4/5] xl: add 'trim' and 'split_string_into_pair' functions

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Sep 24, 2014 at 09:48:04PM +0100, David Scott wrote:
> Signed-off-by: David Scott <dave.scott@xxxxxxxxxx>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

> ---
>  tools/libxl/xl_cmdimpl.c |   66 
> +++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 65 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
> index 1fc2171..d6f311f 100644
> --- a/tools/libxl/xl_cmdimpl.c
> +++ b/tools/libxl/xl_cmdimpl.c
> @@ -300,7 +300,6 @@ static void *xrealloc(void *ptr, size_t sz) {
>      return r;
>  }
>  
> -static char *xstrdup(const char *x) __attribute__ ((unused));
>  static char *xstrdup(const char *x)
>  {
>      char *r;
> @@ -564,6 +563,71 @@ static void split_string_into_string_list(const char 
> *str,
>      free(s);
>  }
>  
> +/* NB: this follows the interface used by <ctype.h>. See 'man 3 ctype'
> +   and look for CTYPE in libxl_internal.h */
> +typedef int (*char_predicate_t)(const int c);
> +
> +static void trim(char_predicate_t predicate, const char *input, char 
> **output) __attribute__ ((unused));
> +static void trim(char_predicate_t predicate, const char *input, char 
> **output)
> +{
> +    char *p, *q, *tmp;
> +    if (*input == '\000')
> +        return;
> +    /* Input has length >= 1 */
> +
> +    p = tmp = xstrdup(input);
> +    /* Skip past the first whitespace */
> +    while ((*p != '\000') && (predicate((unsigned char)*p)))
> +        p ++;
> +    q = p + strlen(p) - 1;
> +    /* q points to the last non-NULL character */
> +    while ((q > p) && (predicate((unsigned char)*q)))
> +        q --;
> +    /* q points to the last character we want */
> +    q ++;
> +    *q = '\000';
> +    *output = xstrdup(p);
> +    free(tmp);
> +}
> +
> +static int split_string_into_pair(const char *str,
> +                                  const char *delim,
> +                                  char **a,
> +                                  char **b) __attribute__ ((unused));
> +static int split_string_into_pair(const char *str,
> +                                  const char *delim,
> +                                  char **a,
> +                                  char **b)
> +{
> +    char *s, *p, *saveptr, *aa = NULL, *bb = NULL;
> +    int rc = 0;
> +
> +    s = xstrdup(str);
> +
> +    p = strtok_r(s, delim, &saveptr);
> +    if (p == NULL) {
> +        rc = ERROR_INVAL;
> +        goto out;
> +    }
> +    aa = xstrdup(p);
> +    p = strtok_r(NULL, delim, &saveptr);
> +    if (p == NULL) {
> +        rc = ERROR_INVAL;
> +        goto out;
> +    }
> +    bb = xstrdup(p);
> +
> +    *a = aa;
> +    aa = NULL;
> +    *b = bb;
> +    bb = NULL;
> +out:
> +    free(s);
> +    free(aa);
> +    free(bb);
> +    return rc;
> +}
> +
>  static int parse_range(const char *str, unsigned long *a, unsigned long *b)
>  {
>      const char *nstr;
> -- 
> 1.7.10.4
> 
> 
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