fix undefined behaviour of use of isalpha, isdigit and tolower - ii - irc it, simple FIFO based irc client
 (HTM) git clone git://git.suckless.org/ii
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       ---
 (DIR) commit 1411224b169b5a2d134111b068e17f3020753ca9
 (DIR) parent bf06f141882477d60a9d30390dd9e43a49fccc11
 (HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
       Date:   Mon, 16 Dec 2019 18:26:01 +0100
       
       fix undefined behaviour of use of isalpha, isdigit and tolower
       
       "The argument c must be EOF or representable as an unsigned char;
        otherwise, the result is undefined."
       
       Diffstat:
         M ii.c                                |       6 +++---
       
       1 file changed, 3 insertions(+), 3 deletions(-)
       ---
 (DIR) diff --git a/ii.c b/ii.c
       @@ -140,9 +140,9 @@ static void
        channel_normalize_path(char *s)
        {
                for (; *s; s++) {
       -                if (isalpha(*s))
       -                        *s = tolower(*s);
       -                else if (!isdigit(*s) && !strchr(".#&+!-", *s))
       +                if (isalpha((unsigned char)*s))
       +                        *s = tolower((unsigned char)*s);
       +                else if (!isdigit((unsigned char)*s) && !strchr(".#&+!-", *s))
                                *s = '_';
                }
        }