Hi I'd like to ask why is this needed. AFAIK, none of the allowed targets use ',' on their table line.
Mikulas On Thu, 13 Jun 2024, Abhinav Jain wrote: > Remove all the escape characters that come before separator. > Tested this code by writing a dummy program containing the two > functions and testing it on below input, sharing results: > > Original string: "field1\,with\,commas,field2\,with\,more\,commas" > Field: "field1" > Field: "with" > Field: "commas" > Field: "field2" > Field: "with" > Field: "more" > Field: "commas" > > Signed-off-by: Abhinav Jain <[email protected]> > --- > PATCH v1: > https://lore.kernel.org/all/[email protected]/ > > Changes since v1: > - Modified the str_field_delimit function as per shared feedback > - Added remove_escaped_characters function > --- > --- > drivers/md/dm-init.c | 53 +++++++++++++++++++++++++++++++++++++++----- > 1 file changed, 47 insertions(+), 6 deletions(-) > > diff --git a/drivers/md/dm-init.c b/drivers/md/dm-init.c > index 2a71bcdba92d..0e31ecf1b48e 100644 > --- a/drivers/md/dm-init.c > +++ b/drivers/md/dm-init.c > @@ -76,6 +76,24 @@ static void __init dm_setup_cleanup(struct list_head > *devices) > } > } > > +/* Remove escape characters from a given field string. */ > +static void __init remove_escape_characters(char *field) > +{ > + char *src = field; > + char *dest = field; > + > + while (*src) { > + if (*src == '\\') { > + src++; > + if (*src) > + *dest++ = *src++; > + } else { > + *dest++ = *src++; > + } > + } > + *dest = '\0'; > +} > + > /** > * str_field_delimit - delimit a string based on a separator char. > * @str: the pointer to the string to delimit. > @@ -87,16 +105,39 @@ static void __init dm_setup_cleanup(struct list_head > *devices) > */ > static char __init *str_field_delimit(char **str, char separator) > { > - char *s; > + char *s, *escaped, *field; > > - /* TODO: add support for escaped characters */ > *str = skip_spaces(*str); > s = strchr(*str, separator); > - /* Delimit the field and remove trailing spaces */ > - if (s) > + > + /* Check for escaped character */ > + escaped = strchr(*str, '\\'); > + while (escaped && (s == NULL || escaped < s)) { > + /* > + * Move the separator search ahead if escaped > + * character comes before. > + */ > + s = strchr(escaped + 1, separator); > + escaped = strchr(escaped + 1, '\\'); > + } > + > + /* If we found a separator, we need to handle escape characters */ > + if (s) { > + *s = '\0'; > + > + remove_escape_characters(*str); > + field = *str; > + *str = s + 1; > + } else { > + /* Handle the last field when no separator is present */ > + s = *str + strlen(*str); > *s = '\0'; > - *str = strim(*str); > - return s ? ++s : NULL; > + > + remove_escape_characters(*str); > + field = *str; > + *str = s; > + } > + return field; > } > > /** > -- > 2.34.1 >
