strsub - substitute first occurrence of pattern with another string

       Lars Wirzenius (lars.wirzenius@helsinki.fi)

Publib                                        C Programmer's Manual                                 STRSUB(3pub)

strsub  finds  the  first  occurrence  of  the  pattern  pat in the string str (using a method similar to
       strstr(3), i.e., no regular expressions), and replaces it with sub.  If pat does not  occur  in  str,  no
       substitution is made.

       Of course, if sub is an empty string, the pattern is deleted from the string.

       To substitute up to two occurrences of "foo" with "bar" in a line, one might do the following.

            p = strsub(line, "foo", "bar");
            if (p != NULL)
                 strsub(line, "foo", "bar");

       strsub - substitute first occurrence of pattern with another string

strsub  returns  a  pointer to the first character after the substitution, or NULL if no substitution was
       made.

publib(3), strstr(3), strgsub(3)

       #include <publib.h>
       char *strsub(char *str, const char *pat, const char *sub);