SCP: Add sim_strlcpy and sim_strlcat for platforms missing strlcpy and strlcat

scp.c

@@ -7842,6 +7842,71 @@ while (1) {
 return 0;
 }
 
+/* strlcat() and strlcpy() are not available on all platforms */
+/* Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com> */
+/*
+ * Appends src to string dst of size siz (unlike strncat, siz is the
+ * full size of dst, not space left).  At most siz-1 characters
+ * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
+ * Returns strlen(src) + MIN(siz, strlen(initial dst)).
+ * If retval >= siz, truncation occurred.
+ */
+size_t sim_strlcat(char *dst, const char *src, size_t size)
+{
+char *d = dst;
+const char *s = src;
+size_t n = size;
+size_t dlen;
+
+/* Find the end of dst and adjust bytes left but don't go past end */
+while (n-- != 0 && *d != '\0')
+    d++;
+dlen = d - dst;
+n = size - dlen;
+
+if (n == 0)
+    return (dlen + strlen(s));
+while (*s != '\0') {
+    if (n != 1) {
+        *d++ = *s;
+        n--;
+        }
+    s++;
+    }
+*d = '\0';
+
+return (dlen + (s - src));          /* count does not include NUL */
+}
+
+/*
+ * Copy src to string dst of size siz.  At most siz-1 characters
+ * will be copied.  Always NUL terminates (unless siz == 0).
+ * Returns strlen(src); if retval >= siz, truncation occurred.
+ */
+size_t sim_strlcpy (char *dst, const char *src, size_t size)
+{
+char *d = dst;
+const char *s = src;
+size_t n = size;
+
+/* Copy as many bytes as will fit */
+if (n != 0) {
+    while (--n != 0) {
+        if ((*d++ = *s++) == '\0')
+            break;
+        }
+    }
+
+    /* Not enough room in dst, add NUL and traverse rest of src */
+    if (n == 0) {
+        if (size != 0)
+            *d = '\0';              /* NUL-terminate dst */
+        while (*s++)
+            ;
+        }
+return (s - src - 1);               /* count does not include NUL */
+}
+
 /* get_yn               yes/no question
 
    Inputs:

scp.h

@@ -156,6 +156,8 @@ int sim_isgraph (char c);
 int sim_isalnum (char c);
 int sim_strncasecmp (const char *string1, const char *string2, size_t len);
 int sim_strcasecmp (const char *string1, const char *string2);
+size_t sim_strlcat (char *dst, const char *src, size_t size);
+size_t sim_strlcpy (char *dst, const char *src, size_t size);
 CONST char *get_sim_opt (int32 opt, CONST char *cptr, t_stat *st);
 const char *put_switches (char *buf, size_t bufsize, uint32 sw);
 CONST char *get_glyph (const char *iptr, char *optr, char mchar);