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author | rsc <devnull@localhost> | 2003-09-30 17:47:42 +0000 |
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committer | rsc <devnull@localhost> | 2003-09-30 17:47:42 +0000 |
commit | ed7c8e8d02c02bdbff1e88a6d8d1419f39af48ad (patch) | |
tree | ebcd32d20b0df2584bce713fefa87620ecd1cce7 /src/cmd/mk/bufblock.c | |
parent | b2cfc4e2e71d0f0a5113ddfbd93c8285cc4d74e4 (diff) | |
download | plan9port-ed7c8e8d02c02bdbff1e88a6d8d1419f39af48ad.tar.gz plan9port-ed7c8e8d02c02bdbff1e88a6d8d1419f39af48ad.tar.bz2 plan9port-ed7c8e8d02c02bdbff1e88a6d8d1419f39af48ad.zip |
Initial import.
Diffstat (limited to 'src/cmd/mk/bufblock.c')
-rw-r--r-- | src/cmd/mk/bufblock.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/src/cmd/mk/bufblock.c b/src/cmd/mk/bufblock.c new file mode 100644 index 00000000..979403bc --- /dev/null +++ b/src/cmd/mk/bufblock.c @@ -0,0 +1,88 @@ +#include "mk.h" + +static Bufblock *freelist; +#define QUANTA 4096 + +Bufblock * +newbuf(void) +{ + Bufblock *p; + + if (freelist) { + p = freelist; + freelist = freelist->next; + } else { + p = (Bufblock *) Malloc(sizeof(Bufblock)); + p->start = Malloc(QUANTA*sizeof(*p->start)); + p->end = p->start+QUANTA; + } + p->current = p->start; + *p->start = 0; + p->next = 0; + return p; +} + +void +freebuf(Bufblock *p) +{ + p->next = freelist; + freelist = p; +} + +void +growbuf(Bufblock *p) +{ + int n; + Bufblock *f; + char *cp; + + n = p->end-p->start+QUANTA; + /* search the free list for a big buffer */ + for (f = freelist; f; f = f->next) { + if (f->end-f->start >= n) { + memcpy(f->start, p->start, p->end-p->start); + cp = f->start; + f->start = p->start; + p->start = cp; + cp = f->end; + f->end = p->end; + p->end = cp; + f->current = f->start; + break; + } + } + if (!f) { /* not found - grow it */ + p->start = Realloc(p->start, n); + p->end = p->start+n; + } + p->current = p->start+n-QUANTA; +} + +void +bufcpy(Bufblock *buf, char *cp, int n) +{ + + while (n--) + insert(buf, *cp++); +} + +void +insert(Bufblock *buf, int c) +{ + + if (buf->current >= buf->end) + growbuf(buf); + *buf->current++ = c; +} + +void +rinsert(Bufblock *buf, Rune r) +{ + int n; + + n = runelen(r); + if (buf->current+n > buf->end) + growbuf(buf); + runetochar(buf->current, &r); + buf->current += n; +} |