Hello!

I attempted to use your project with the following scenario, which is described in README.md:

or alternatively add the sources md4c.[hc], md4c-html.[hc] and entity.[hc] into your code base

However, compiler yells about macro naming collisions:

md4c-html.c:67: warning: "ISDIGIT" redefined
   67 | #define ISDIGIT(ch)     ('0' <= (ch) && (ch) <= '9')
      | 
In file included:
md4c.c:314: note: this is the location of the previous definition
  314 | #define ISDIGIT(off)                    ISDIGIT_(CH(off))
      | 
In file included:
md4c-html.c:68: warning: "ISLOWER" redefined
   68 | #define ISLOWER(ch)     ('a' <= (ch) && (ch) <= 'z')
      | 
In file included:
md4c.c:312: note: this is the location of the previous definition
  312 | #define ISLOWER(off)                    ISLOWER_(CH(off))
      | 
In file included:
md4c-html.c:69: warning: "ISUPPER" redefined
   69 | #define ISUPPER(ch)     ('A' <= (ch) && (ch) <= 'Z')
      | 
In file included from:
md4c.c:311: note: this is the location of the previous definition
  311 | #define ISUPPER(off)                    ISUPPER_(CH(off))
      | 
In file included from:
md4c-html.c:70: warning: "ISALNUM" redefined
   70 | #define ISALNUM(ch)     (ISLOWER(ch) || ISUPPER(ch) || ISDIGIT(ch))
      | 
In file included from:
md4c.c:316: note: this is the location of the previous definition
  316 | #define ISALNUM(off)                    ISALNUM_(CH(off))
      |

Also, macroses like ISLOWER are very commonly-used, so in order to easily include .c files directly into anyone's project, IMO it would be a great idea to add prefix to their names. I followed project naming rule (MD_ prefix) and did it on my own.

Regards, Xdevelnet

Codecov Report

Merging #177 (f81b3e8) into master (e9ff661) will not change coverage. The diff coverage is 98.46%.

@@           Coverage Diff           @@
##           master     #177   +/-   ##
=======================================
  Coverage   94.32%   94.32%           
=======================================
  Files           3        3           
  Lines        3100     3100           
=======================================
  Hits         2924     2924           
  Misses        176      176

Impacted Files	Coverage Δ
src/md4c.c	`94.23% <98.44%> (ø)`
src/md4c-html.c	`95.20% <100.00%> (ø)`

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mity / md4c

Avoid collisions when including .c files themselves #177

Codecov Report