diff options
| -rw-r--r-- | core/state.c | 5 | ||||
| -rw-r--r-- | core/tokbuf.c | 62 | ||||
| -rw-r--r-- | include/cescal/state.h | 7 | ||||
| -rw-r--r-- | include/cescal/tokbuf.h | 50 |
4 files changed, 122 insertions, 2 deletions
diff --git a/core/state.c b/core/state.c index 7d80acd..912508c 100644 --- a/core/state.c +++ b/core/state.c @@ -23,6 +23,11 @@ state_init(struct cescal_state *state, const char *pathname) return -1; } + if (tokbuf_init(&state->tokbuf) < 0) { + close(state->in_fd); + return -1; + } + return 0; } diff --git a/core/tokbuf.c b/core/tokbuf.c new file mode 100644 index 0000000..e880c15 --- /dev/null +++ b/core/tokbuf.c @@ -0,0 +1,62 @@ +/* + * Copyright (c) 2026, Chloe M. + * Provided under the BSD-3 clause + */ + +#include <sys/types.h> +#include <stdint.h> +#include <stddef.h> +#include <string.h> +#include <errno.h> +#include "cescal/tokbuf.h" + +int +tokbuf_init(struct tokbuf *tokbuf) +{ + if (tokbuf == NULL) { + errno = EINVAL; + return -1; + } + + memset(tokbuf->buf, 0, sizeof(tokbuf->buf)); + tokbuf->head = 0; + return 0; +} + +int +tokbuf_push(struct tokbuf *tokbuf, struct token *tok) +{ + if (tokbuf == NULL || tok == NULL) { + return -1; + } + + if ((tokbuf->head++) >= TOKBUF_CAP) { + tokbuf->head = 0; + } + + tokbuf->buf[tokbuf->head] = *tok; + return 0; +} + +int +tokbuf_noff(struct tokbuf *tokbuf, size_t noff, struct token *res) +{ + ssize_t off; + + if (tokbuf == NULL || res == NULL) { + errno = EINVAL; + return -1; + } + + if (noff == 0) { + *res = tokbuf->buf[tokbuf->head + 1]; + return 0; + } + + if ((off = (tokbuf->head - noff + 1)) < 0) { + off = 0; + } + + *res = tokbuf->buf[off]; + return 0; +} diff --git a/include/cescal/state.h b/include/cescal/state.h index c604270..e832bc9 100644 --- a/include/cescal/state.h +++ b/include/cescal/state.h @@ -8,16 +8,19 @@ #include <stdint.h> #include "cescal/readbuf.h" +#include "cescal/tokbuf.h" /* * Compiler state machine * - * @in_fd: Input file descriptor - * @rb: Read buffer + * @in_fd: Input file descriptor + * @rb: Read buffer + * @tokbuf: Token buffer */ struct cescal_state { int in_fd; struct readbuf rb; + struct tokbuf tokbuf; }; /* diff --git a/include/cescal/tokbuf.h b/include/cescal/tokbuf.h new file mode 100644 index 0000000..528cb02 --- /dev/null +++ b/include/cescal/tokbuf.h @@ -0,0 +1,50 @@ +/* + * Copyright (c) 2026, Chloe M. + * Provided under the BSD-3 clause + */ + +#ifndef CESCAL_TOKBUF_H +#define CESCAL_TOKBUF_H 1 + +#include <stdint.h> +#include <stddef.h> +#include "cescal/token.h" + +#define TOKBUF_CAP 4 + +struct tokbuf { + struct token buf[TOKBUF_CAP]; + uint8_t head; +}; + +/* + * Initialize the token buffer + * + * @tokbuf: Token buffer to initialize + * + * Returns zero on success + */ +int tokbuf_init(struct tokbuf *tokbuf); + +/* + * Push a token onto the token buffer + * + * @tokbuf: Token buffer to push to + * @tok: Token to push + * + * Returns zero on success + */ +int tokbuf_push(struct tokbuf *tokbuf, struct token *tok); + +/* + * Peek at the token buffer from a negative offset backwards + * + * @tokbuf: Token buffer to read from + * @noff: Negative offset + * @res: Result is written here + * + * Returns zero on success + */ +int tokbuf_noff(struct tokbuf *tokbuf, size_t noff, struct token *res); + +#endif /* !CESCAL_TOKBUF_H */ |