summaryrefslogtreecommitdiff
path: root/libc/string/string.c
diff options
context:
space:
mode:
Diffstat (limited to 'libc/string/string.c')
-rw-r--r--libc/string/string.c580
1 files changed, 116 insertions, 464 deletions
diff --git a/libc/string/string.c b/libc/string/string.c
index 0025cec2b..1777ce03c 100644
--- a/libc/string/string.c
+++ b/libc/string/string.c
@@ -6,21 +6,10 @@
#include <string.h>
#include <malloc.h>
-#ifdef __AS386_16__
-#if __FIRST_ARG_IN_AX__
-#define BCC_AX_ASM /* BCC Assembler that can cope with arg in AX */
-#else
-#define BCC_AX_ASM
-#define BCC_ASM /* Use 16 bit BCC assembler */
-#endif
-
-#define PARANOID /* Include extra code for cld and ES register */
-#endif
-
/* This is a basic string package; it includes the most used functions
strlen strcat strcpy strcmp strncat strncpy strncmp strchr strrchr strdup
- memcpy memccpy memchr memset memcmp memmove
+ memcpy memccpy memset memmove
These functions are in seperate files.
strpbrk.o strsep.o strstr.o strtok.o strcspn.o
@@ -30,56 +19,18 @@
/********************** Function strlen ************************************/
#ifdef L_strlen
-size_t strlen(str)
-const char * str;
+size_t strlen(const char * str)
{
-#ifdef BCC_AX_ASM
-#asm
-#if !__FIRST_ARG_IN_AX__
- mov bx,sp
-#endif
- push di
-
-#ifdef PARANOID
- push es
- push ds ; Im not sure if this is needed, so just in case.
- pop es
- cld
-#endif ! This is almost the same as memchr, but it can
- ! stay as a special.
-
-#if __FIRST_ARG_IN_AX__
- mov di,ax
-#else
- mov di,[bx+2]
-#endif
- mov cx,#-1
- xor ax,ax
- repne
- scasb
- not cx
- dec cx
- mov ax,cx
-
-#ifdef PARANOID
- pop es
-#endif
- pop di
-#endasm
-#else
register char * p =(char *) str;
while(*p) p++;
return p-str;
-#endif /* ifdef BCC_AX_ASM */
}
#endif
/********************** Function strcat ************************************/
#ifdef L_strcat
-char * strcat(d, s)
-char *d;
-const char * s;
+char * strcat(char *d, const char * s)
{
(void) strcpy(d+strlen(d), s);
return d;
@@ -89,9 +40,7 @@ const char * s;
/********************** Function strcpy ************************************/
#ifdef L_strcpy
-char * strcpy(d, s)
-char *d;
-const char * s;
+char * strcpy( char *d, const char * s)
{
/* This is probably the quickest on an 8086 but a CPU with a cache will
* prefer to do this in one pass */
@@ -102,68 +51,29 @@ const char * s;
/********************** Function strcmp ************************************/
#ifdef L_strcmp
-int strcmp(d, s)
-const char *d;
-const char * s;
+int strcmp(const char *d, const char * s)
{
- /* There are a number of ways to do this and it really does depend on the
- types of strings given as to which is better, nevertheless the Glib
- method is quite reasonable so we'll take that */
-
-#ifdef BCC_AX_ASM
-#asm
- mov bx,sp
- push di
- push si
-
-#ifdef PARANOID
- push es
- push ds ; Im not sure if this is needed, so just in case.
- pop es
- cld
-#endif
-
-#if __FIRST_ARG_IN_AX__
- mov di,ax ; dest
- mov si,[bx+2] ; source
-#else
- mov di,[bx+2] ; dest
- mov si,[bx+4] ; source
-#endif
-sc_1:
- lodsb
- scasb
- jne sc_2 ; If bytes are diff skip out.
- testb al,al
- jne sc_1 ; If this byte in str1 is nul the strings are equal
- xor ax,ax ; so return zero
- jmp sc_3
-sc_2:
- sbb ax,ax ; Collect correct val (-1,1).
- orb al,#1
-sc_3:
-
-#ifdef PARANOID
- pop es
-#endif
- pop si
- pop di
-#endasm
-#else /* ifdef BCC_AX_ASM */
- register char *s1=(char *)d, *s2=(char *)s, c1,c2;
- while((c1= *s1++) == (c2= *s2++) && c1 );
- return c1 - c2;
-#endif /* ifdef BCC_AX_ASM */
+ register const unsigned char *s1 = (const unsigned char *) d;
+ register const unsigned char *s2 = (const unsigned char *) s;
+ unsigned register char c1, c2;
+
+ do
+ {
+ c1 = (unsigned char) *s1++;
+ c2 = (unsigned char) *s2++;
+ if (c1 == '\0')
+ return c1 - c2;
+ }
+ while (c1 == c2);
+
+ return c1 - c2;
}
#endif
/********************** Function strncat ************************************/
#ifdef L_strncat
-char * strncat(d, s, l)
-char *d;
-const char *s;
-size_t l;
+char * strncat( char *d, const char *s, size_t l)
{
register char *s1=d+strlen(d), *s2;
@@ -182,86 +92,110 @@ size_t l;
/********************** Function strncpy ************************************/
#ifdef L_strncpy
-char * strncpy(d, s, l) /* FIXME need the fast version of this */
-char *d;
-const char *s;
-size_t l;
+char * strncpy ( char *s1, const char *s2, size_t n)
{
- register char *s1=d;
- register const char *s2=s;
- while(l > 0)
- {
- l--;
- if( (*s1++ = *s2++) == '\0')
- break;
- }
-
- /* This _is_ correct strncpy is supposed to zap */
- for(; l>0; l--) *s1++ = '\0';
- return d;
+ register char c;
+ char *s = s1;
+
+ --s1;
+
+ if (n >= 4)
+ {
+ size_t n4 = n >> 2;
+
+ for (;;)
+ {
+ c = *s2++;
+ *++s1 = c;
+ if (c == '\0')
+ break;
+ c = *s2++;
+ *++s1 = c;
+ if (c == '\0')
+ break;
+ c = *s2++;
+ *++s1 = c;
+ if (c == '\0')
+ break;
+ c = *s2++;
+ *++s1 = c;
+ if (c == '\0')
+ break;
+ if (--n4 == 0)
+ goto last_chars;
+ }
+ n = n - (s1 - s) - 1;
+ if (n == 0)
+ return s;
+ goto zero_fill;
+ }
+
+last_chars:
+ n &= 3;
+ if (n == 0)
+ return s;
+
+ do
+ {
+ c = *s2++;
+ *++s1 = c;
+ if (--n == 0)
+ return s;
+ }
+ while (c != '\0');
+
+zero_fill:
+ do
+ *++s1 = '\0';
+ while (--n > 0);
+
+ return s;
}
#endif
/********************** Function strncmp ************************************/
#ifdef L_strncmp
-int strncmp(d, s, l)
-const char *d, *s;
-size_t l;
+int strncmp (const char *s1, const char *s2, size_t n)
{
-#ifdef BCC_AX_ASM
-#asm
- mov bx,sp
- push si
- push di
-
-#ifdef PARANOID
- push es
- push ds ! Im not sure if this is needed, so just in case.
- pop es
- cld
-#endif
-
-#if __FIRST_ARG_IN_AX__
- mov si,ax
- mov di,[bx+2]
- mov cx,[bx+4]
-#else
- mov si,[bx+2] ! Fetch
- mov di,[bx+4]
- mov cx,[bx+6]
-#endif
-
- inc cx
-lp1:
- dec cx
- je lp2
- lodsb
- scasb
- jne lp3
- testb al,al
- jne lp1
-lp2:
- xor ax,ax
- jmp lp4
-lp3:
- sbb ax,ax
- or al,#1
-lp4:
-
-#ifdef PARANOID
- pop es
-#endif
- pop di
- pop si
-#endasm
-#else
- register char c1=0, c2=0;
- while(l-- >0)
- if( (c1= *d++) != (c2= *s++) || c1 == '\0' )
- break;
- return c1-c2;
-#endif
+ unsigned register char c1 = '\0';
+ unsigned register char c2 = '\0';
+
+ if (n >= 4)
+ {
+ size_t n4 = n >> 2;
+ do
+ {
+ c1 = (unsigned char) *s1++;
+ c2 = (unsigned char) *s2++;
+ if (c1 == '\0' || c1 != c2)
+ return c1 - c2;
+ c1 = (unsigned char) *s1++;
+ c2 = (unsigned char) *s2++;
+ if (c1 == '\0' || c1 != c2)
+ return c1 - c2;
+ c1 = (unsigned char) *s1++;
+ c2 = (unsigned char) *s2++;
+ if (c1 == '\0' || c1 != c2)
+ return c1 - c2;
+ c1 = (unsigned char) *s1++;
+ c2 = (unsigned char) *s2++;
+ if (c1 == '\0' || c1 != c2)
+ return c1 - c2;
+ } while (--n4 > 0);
+ n &= 3;
+ }
+
+ while (n > 0)
+ {
+ c1 = (unsigned char) *s1++;
+ c2 = (unsigned char) *s2++;
+ if (c1 == '\0' || c1 != c2)
+ return c1 - c2;
+ n--;
+ }
+
+ return c1 - c2;
}
#endif
@@ -273,37 +207,6 @@ strchr(s, c)
const char * s;
int c;
{
-#ifdef BCC_AX_ASM
-#asm
- mov bx,sp
- push si
-#if __FIRST_ARG_IN_AX__
- mov bx,[bx+2]
- mov si,ax
-#else
- mov si,[bx+2]
- mov bx,[bx+4]
-#endif
- xor ax,ax
-
-#ifdef PARANOID
- cld
-#endif
-
-in_loop:
- lodsb
- cmp al,bl
- jz got_it
- or al,al
- jnz in_loop
- pop si
- ret
-got_it:
- lea ax,[si-1]
- pop si
-
-#endasm
-#else /* ifdef BCC_AX_ASM */
register char ch;
for(;;)
{
@@ -311,7 +214,6 @@ got_it:
if( ch == 0 ) return 0;
s++;
}
-#endif /* ifdef BCC_AX_ASM */
}
#endif
@@ -361,52 +263,9 @@ void *d;
const void *s;
size_t l;
{
-#ifdef BCC_AX_ASM
-#asm
- mov bx,sp
- push di
- push si
-
-#ifdef PARANOID
- push es
- push ds ; Im not sure if this is needed, so just in case.
- pop es
- cld
-#endif
-
-#if __FIRST_ARG_IN_AX__
- mov di,ax ; dest
- mov si,[bx+2] ; source
- mov cx,[bx+4] ; count
-#else
- mov di,[bx+2] ; dest
- mov si,[bx+4] ; source
- mov cx,[bx+6] ; count
-
- mov ax,di
-#endif
- ; If di is odd mov 1 byte before doing word move
- ; this will speed slightly but
- ; NB 8086 has no problem with mis-aligned access.
-
- shr cx,#1 ; Do this faster by doing a mov word
- rep
- movsw
- adc cx,cx ; Retrieve the leftover 1 bit from cflag.
- rep
- movsb
-
-#ifdef PARANOID
- pop es
-#endif
- pop si
- pop di
-#endasm
-#else /* ifdef BCC_AX_ASM */
register char *s1=d, *s2=(char *)s;
for( ; l>0; l--) *((unsigned char*)s1++) = *((unsigned char*)s2++);
return d;
-#endif /* ifdef BCC_AX_ASM */
}
#endif
@@ -427,59 +286,6 @@ size_t l;
}
#endif
-/********************** Function memchr ************************************/
-
-#ifdef L_memchr
-void * memchr(str, c, l)
-const void * str;
-int c;
-size_t l;
-{
-#ifdef BCC_ASM
-#asm
- mov bx,sp
- push di
-
-#ifdef PARANOID
- push es
- push ds ; Im not sure if this is needed, so just in case.
- pop es
- cld
-#endif
-
- mov di,[bx+2]
- mov ax,[bx+4]
- mov cx,[bx+6]
- test cx,cx
- je is_z ! Zero length, do not find.
-
- repne ! Scan
- scasb
- jne is_z ! Not found, ret zero
- dec di ! Adjust ptr
- mov ax,di ! return
- jmp xit
-is_z:
- xor ax,ax
-xit:
-
-#ifdef PARANOID
- pop es
-#endif
- pop di
-#endasm
-#else /* ifdef BCC_ASM */
- register char *p=(char *)str;
- while(l-- > 0)
- {
- if(*p == c) return p;
- p++;
- }
- return 0;
-#endif /* ifdef BCC_ASM */
-}
-#endif
-
/********************** Function memset ************************************/
#ifdef L_memset
@@ -488,109 +294,9 @@ void * str;
int c;
size_t l;
{
-#ifdef BCC_AX_ASM
-#asm
- mov bx,sp
- push di
-
-#ifdef PARANOID
- push es
- push ds ; Im not sure if this is needed, so just in case.
- pop es
- cld
-#endif
-
-#if __FIRST_ARG_IN_AX__
- mov di,ax ; Fetch
- mov ax,[bx+2]
- mov cx,[bx+4]
-#else
- mov di,[bx+2] ; Fetch
- mov ax,[bx+4]
- mov cx,[bx+6]
-#endif
-
-; How much difference does this alignment make ?
-; I don`t think it`s significant cause most will already be aligned.
-
-; test cx,cx ; Zero size - skip
-; je xit
-;
-; test di,#1 ; Line it up
-; je s_1
-; stosb
-; dec cx
-;s_1:
-
- mov ah,al ; Replicate byte
- shr cx,#1 ; Do this faster by doing a sto word
- rep ; Bzzzzz ...
- stosw
- adc cx,cx ; Retrieve the leftover 1 bit from cflag.
-
- rep ; ... z
- stosb
-
-xit:
- mov ax,[bx+2]
-#ifdef PARANOID
- pop es
-#endif
- pop di
-#endasm
-#else /* ifdef BCC_AX_ASM */
register char *s1=str;
while(l-->0) *s1++ = c;
return str;
-#endif /* ifdef BCC_AX_ASM */
-}
-#endif
-
-/********************** Function memcmp ************************************/
-
-#ifdef L_memcmp
-int memcmp(s, d, l)
-const void *s, *d;
-size_t l;
-{
-#ifdef BCC_ASM
-#asm
- mov bx,sp
- push di
- push si
-
-#ifdef PARANOID
- push es
- push ds ! Im not sure if this is needed, so just in case.
- pop es
- cld
-#endif
-
- mov si,[bx+2] ! Fetch
- mov di,[bx+4]
- mov cx,[bx+6]
- xor ax,ax
-
- rep ! Bzzzzz
- cmpsb
- je xit ! All the same!
- sbb ax,ax
- sbb ax,#-1 ! choose +/-1
-xit:
-#ifdef PARANOID
- pop es
-#endif
- pop si
- pop di
-#endasm
-#else /* ifdef BCC_ASM */
- register const char *s1=d, *s2=s;
- register char c1=0, c2=0;
- while(l-- > 0)
- if( (c1= *s1++) != (c2= *s2++) )
- break;
- return c1-c2;
-#endif /* ifdef BCC_ASM */
}
#endif
@@ -615,60 +321,6 @@ size_t l;
}
#endif
-/********************** Function movedata ***********************************/
-
-#ifdef L_movedata
-
-/* NB There isn't any C version of this function ... */
-
-#ifdef BCC_AX_ASM
-void
-__movedata(srcseg, srcoff, destseg, destoff, len)
-unsigned int srcseg, srcoff, destseg, destoff, len;
-{
-#asm
- push bp
- mov bp,sp
- push si
- push di
- push ds
-#ifdef PARANOID
- push es
- cld
-#endif
-
- ! sei ! Are we _really_ paranoid ?
-
-#if !__FIRST_ARG_IN_AX__
- mov ds,[bp+4] ! Careful, [bp+xx] is SS based.
- mov si,[bp+6]
- mov es,[bp+8]
- mov di,[bp+10]
- mov cx,[bp+12]
-#else
- mov ds,ax
- mov si,[bp+4]
- mov es,[bp+6]
- mov di,[bp+8]
- mov cx,[bp+10]
-#endif
- rep
- movsb
-
- ! cli ! Are we _really_ paranoid ?
-
-#ifdef PARANOID
- pop es
-#endif
- pop ds
- pop di
- pop si
- pop bp
-#endasm
-}
-#endif
-
-#endif
/********************** THE END ********************************************/
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 12:00:19 +0000