diff options
Diffstat (limited to 'doc.c')
| -rw-r--r-- | doc.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/doc.c b/doc.c index d5da6bf..3d1b378 100644 --- a/doc.c +++ b/doc.c @@ -5,6 +5,8 @@ #include "doc.h" #include "err.h" +/* initialization / destruction */ + void doc_init(struct doc *d) { buf_init(&d->txt, sizeof(struct doc_line)); buf_init(&d->lnk, 1); @@ -22,6 +24,8 @@ void doc_fini(struct doc *d) { buf_free(&d->lnk); } +/* line creation */ + void doc_new_line(struct doc *d) { buf_grow(&d->txt, sizeof(struct doc_line)); *(struct doc_line *)&d->txt.buf[d->txt.sz] = (struct doc_line) { @@ -49,3 +53,29 @@ void doc_add_textn(struct doc *d, const char *s, size_t n) { d->txt.sz += n; dl->len += n; } + +/* line navigation */ + +struct doc_line *doc_line_at(struct doc *d, size_t ofs) { + return (struct doc_line *)&d->txt.buf[ofs]; +} + +int doc_line_prev(struct doc *d, size_t *ofs) { + size_t n = doc_line_at(d, *ofs)->prev + sizeof(struct doc_line); + if (*ofs >= n) { + *ofs -= n; + return 0; + } else { + return -1; + } +} + +int doc_line_next(struct doc *d, size_t *ofs) { + size_t n = doc_line_at(d, *ofs)->len + sizeof(struct doc_line); + if (*ofs + n < d->txt.sz) { + *ofs += n; + return 0; + } else { + return -1; + } +} |