>> #define lcd_puts(s) { while(*s) lcd_putc(*s++); }
>
>That will not work if "s" is a string literal, which is what the OP
>was trying to deal with.

#define lcd_putcs(s) { const char *p; p=s; while(*p) lcd_putc(*p++); }
#define lcd_puts(s)  { char *p;       p=s; while(*p) lcd_putc(*p++); }

There is not enough stack on small pics (16F) to afford the luxury of too
deep nesting in libraries. In fact, the way I write it usually is,
lcd_puts is a function and lcd_putc is a macro used in it. lcd_cmd is a
function that also uses lcd_putc (lcd_cmd sends commands to the lcd).

Peter

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