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STATIC uint8_t readmove(char);
STATIC int64_t readmoves(const char *, size_t n, uint8_t [n]);
STATIC uint8_t readmodifier(char);
STATIC int64_t writemoves(size_t n, const uint8_t [n], size_t m, char [m]);
#define FOREACH_READMOVE(ARG_BUF, ARG_MOVE, ARG_C, ARG_MAX, \
RET_ERROR, ARG_ACTION) \
const char *VAR_B; \
uint8_t VAR_MOVE_NOMOD, VAR_MOD; \
for (VAR_B = ARG_BUF, ARG_C = 0; *VAR_B != '\0'; VAR_B++, ARG_C++) { \
while (*VAR_B == ' ' || *VAR_B == '\t' || *VAR_B == '\n') \
VAR_B++; \
if (*VAR_B == '\0' || ARG_C == ARG_MAX) \
break; \
if ((VAR_MOVE_NOMOD = readmove(*VAR_B)) == UINT8_ERROR) { \
LOG("Error: unknown move '%c'\n", *VAR_B); \
return RET_ERROR; \
} \
if ((VAR_MOD = readmodifier(*(VAR_B+1))) != 0) \
VAR_B++; \
ARG_MOVE = VAR_MOVE_NOMOD + VAR_MOD; \
ARG_ACTION \
}
STATIC uint8_t
readmove(char c)
{
switch (c) {
case 'U':
return MOVE_U;
case 'D':
return MOVE_D;
case 'R':
return MOVE_R;
case 'L':
return MOVE_L;
case 'F':
return MOVE_F;
case 'B':
return MOVE_B;
default:
return UINT8_ERROR;
}
}
STATIC uint8_t
readmodifier(char c)
{
switch (c) {
case '1': /* Fallthrough */
case '2': /* Fallthrough */
case '3':
return c - '0' - 1;
case '\'':
return 2;
default:
return 0;
}
}
STATIC int64_t
readmoves(const char *buf, size_t n, uint8_t ret[n])
{
uint8_t m;
uint64_t c;
FOREACH_READMOVE(buf, m, c, n, NISSY_ERROR_INVALID_MOVES,
ret[c] = m;
)
return (int64_t)c;
}
STATIC int64_t
writemoves(
size_t nmoves,
const uint8_t m[nmoves],
size_t buf_size,
char buf[buf_size]
)
{
size_t i, len, w;
const char *s;
if (buf_size == 0) {
LOG("Error: cannot write moves to buffer of size 0.\n");
return NISSY_ERROR_BUFFER_SIZE;
}
for (i = 0, w = 0; i < nmoves; i++, w++) {
s = movestr[m[i]];
len = strlen(s);
if (len + w >= buf_size) {
LOG("Error: the given buffer is too small for "
"writing the given moves.\n");
goto writemoves_error;
}
memcpy(buf+w, s, len);
w += len;
buf[w] = ' ';
}
if (w > 0) w--; /* Remove last space */
buf[w] = '\0';
return (int64_t)w;
writemoves_error:
*buf = '\0';
return NISSY_ERROR_BUFFER_SIZE;
}
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