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author | rsc <devnull@localhost> | 2003-12-11 18:15:57 +0000 |
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committer | rsc <devnull@localhost> | 2003-12-11 18:15:57 +0000 |
commit | 7f11104a5737adf261d10bc1a7b85e740f2eb491 (patch) | |
tree | 2473f5fbdd42b74b189e2fcc2a46896a50ede030 /src/libString/s_alloc.c | |
parent | 57ccfb9e8f51138c33ad5f58e14c0e54246cf5c4 (diff) | |
download | plan9port-7f11104a5737adf261d10bc1a7b85e740f2eb491.tar.gz plan9port-7f11104a5737adf261d10bc1a7b85e740f2eb491.tar.bz2 plan9port-7f11104a5737adf261d10bc1a7b85e740f2eb491.zip |
Add libString.
Diffstat (limited to 'src/libString/s_alloc.c')
-rw-r--r-- | src/libString/s_alloc.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/libString/s_alloc.c b/src/libString/s_alloc.c new file mode 100644 index 00000000..34f89164 --- /dev/null +++ b/src/libString/s_alloc.c @@ -0,0 +1,86 @@ +#include <u.h> +#include <libc.h> +#include "libString.h" + +#define STRLEN 128 + +extern void +s_free(String *sp) +{ + if (sp == nil) + return; + lock(&sp->lk); + if(--(sp->ref) != 0){ + unlock(&sp->lk); + return; + } + unlock(&sp->lk); + + if(sp->fixed == 0 && sp->base != nil) + free(sp->base); + free(sp); +} + +/* get another reference to a string */ +extern String * +s_incref(String *sp) +{ + lock(&sp->lk); + sp->ref++; + unlock(&sp->lk); + + return sp; +} + +/* allocate a String head */ +extern String * +_s_alloc(void) +{ + String *s; + + s = mallocz(sizeof *s, 1); + if(s == nil) + return s; + s->ref = 1; + s->fixed = 0; + return s; +} + +/* create a new `short' String */ +extern String * +s_newalloc(int len) +{ + String *sp; + + sp = _s_alloc(); + if(sp == nil) + sysfatal("s_newalloc: %r"); + setmalloctag(sp, getcallerpc(&len)); + if(len < STRLEN) + len = STRLEN; + sp->base = sp->ptr = malloc(len); + if (sp->base == nil) + sysfatal("s_newalloc: %r"); + setmalloctag(sp->base, getcallerpc(&len)); + + sp->end = sp->base + len; + s_terminate(sp); + return sp; +} + +/* create a new `short' String */ +extern String * +s_new(void) +{ + String *sp; + + sp = _s_alloc(); + if(sp == nil) + sysfatal("s_new: %r"); + sp->base = sp->ptr = malloc(STRLEN); + if (sp->base == nil) + sysfatal("s_new: %r"); + sp->end = sp->base + STRLEN; + s_terminate(sp); + return sp; +} |