diff options
Diffstat (limited to 'libc/bcc/heap.c')
| -rw-r--r-- | libc/bcc/heap.c | 88 |
1 files changed, 78 insertions, 10 deletions
diff --git a/libc/bcc/heap.c b/libc/bcc/heap.c index af4e898..6a6ce2c 100644 --- a/libc/bcc/heap.c +++ b/libc/bcc/heap.c @@ -3,6 +3,8 @@ * under the GNU Library General Public License. */ +#include <errno.h> + /****************************************************************************/ #ifdef L_errno @@ -11,8 +13,9 @@ int errno = 0; /* libc error value */ /****************************************************************************/ -#ifdef L___brk_addr #ifdef __AS386_16__ + +#ifdef L___brk_addr #asm .data export brk_addr @@ -20,14 +23,12 @@ brk_addr: .word __end ! This holds the current return for sbrk(0) .text #endasm #endif -#endif /****************************************************************************/ #ifdef L_sbrk -#ifdef __AS386_16__ int sbrk(brk_off) -unsigned int brk_off; +int brk_off; { #asm mov bx,sp @@ -36,14 +37,14 @@ unsigned int brk_off; #endif test ax,ax jnz has_change - mov ax,[brk_addr] ! Simple one; read current - can`t fail. + mov ax,[brk_addr] ! Simple one, read current - can`t fail. jmp eof has_change: js go_down add ax,[brk_addr] ! Goin up! jc Enomem - sub bx,#64 ! Safety space + sub bx,#512 ! Safety space 512 bytes cmp bx,ax ! Too close ? jb Enomem @@ -71,22 +72,20 @@ eof: #endasm } #endif -#endif /****************************************************************************/ #ifdef L_brk -#ifdef __AS386_16__ int brk(new_brk) -void * new_brk; +char * new_brk; { #asm mov bx,sp #if !__FIRST_ARG_IN_AX__ mov ax,[bx+2] ! Fetch the requested value #endif - sub bx,#64 ! Safety space + sub bx,#512 ! Safety space 512 bytes cmp bx,ax ! Too close ? jb Enomem cmp ax,#__end @@ -111,6 +110,75 @@ brk_ok: #endasm } #endif + #endif /****************************************************************************/ + +#ifdef __AS386_32__ +extern char * __brk_addr; +extern char * __brk(); + +#ifdef L___brk_addr +char * __brk_addr = 0; /* This holds the current return for sbrk(0) */ + +char * +__brk(val) +{ +#asm +#if __FIRST_ARG_IN_AX__ + mov ebx,eax +#else + mov ebx,[esp+4] +#endif + mov eax,#45 + int $80 +#endasm +} + +__brk_addr_init() +{ + if( __brk_addr == 0 && (__brk_addr = __brk(0)) == 0 ) + { + errno = ENOMEM; + return -1; + } + return 0; +} +#endif + +#ifdef L_sbrk +char * +sbrk(brk_off) +int brk_off; +{ + char * new_brk; + if( __brk_addr_init() ) return (char*)-1; + if( brk_off == 0 ) return __brk_addr; + + new_brk = __brk_addr + brk_off; + __brk_addr = __brk(new_brk); + if( __brk_addr != new_brk ) + { + errno = ENOMEM; + return (char*)-1; + } + return __brk_addr - brk_off; +} +#endif + +#ifdef L_brk +int +brk(new_brk) +char * new_brk; +{ + if( __brk_addr_init() ) return -1; + + __brk_addr = __brk(new_brk); + if( __brk_addr == new_brk ) return 0; + errno = ENOMEM; + return -1; +} +#endif + +#endif |