strgsub - substitute all occurrences of pattern with another string

       Lars Wirzenius (lars.wirzenius@helsinki.fi)

Publib                                        C Programmer's Manual                                STRGSUB(3pub)

strgsub  finds  all occurrences of the pattern pat in the string str (using a method similar to strstr(3)
       to find the occurrences, i.e., no regular expressions), and replaces each with sub. If pat does not occur
       in str, no substitution is made.  The size (including the terminating  '\0')  of  the  string  after  the
       substitutions may be at most max chars.  If it would be larger, no substitutions are made.

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

       To substitute every "foo" with "bar" in a line, one might do the following.

            strgsub(line, "foo", "bar", strlen(line)+1);

       strgsub - substitute all occurrences of pattern with another string

strgsub returns the number of substitutions made, or -1 if the result would not have fit into max chars.

publib(3), strstr(3), strsub(3)

       #include <publib.h>
       int strgsub(char *str, const char *pat, const char *sub, size_t max);