/* strtok (str, delim) -- Return next DELIM separated token from STR. For Intel 80x86, x>=3. Copyright (C) 1996 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <sysdep.h> /* This file can be used for three variants of the strtok function: strtok: INPUT PARAMETER: str (sp + 4) delim (sp + 8) strtok_r: INPUT PARAMETER: str (sp + 4) delim (sp + 8) save_ptr (sp + 12) We do a common implementation here. */ #ifndef USE_AS_STRTOK_R .bss .local save_ptr ASM_TYPE_DIRECTIVE (save_ptr, @object) .size save_ptr, 4 save_ptr: .space 4 #define FUNCTION strtok #endif .text ENTRY (FUNCTION) movl 4(%esp), %edx /* Get start of string. */ movl 8(%esp), %eax /* Get start of delimiter set. */ #if !defined (USE_AS_STRTOK_R) && defined (PIC) pushl %ebx /* Save PIC register. */ call Lhere Lhere: popl %ebx addl $_GLOBAL_OFFSET_TABLE_+[.-Lhere], %ebx #endif /* If the pointer is NULL we have to use the stored value of the last run. */ cmpl $0, %edx jne L0 #ifdef USE_AS_STRTOK_R /* The value is stored in the third argument. */ movl 12(%esp), %edx movl (%edx), %edx #else /* The value is in the local variable defined above. But we have to take care for PIC code. */ # ifndef PIC movl save_ptr, %edx # else movl save_ptr@GOTOFF(%ebx), %edx # endif #endif L0: /* First we create a table with flags for all possible characters. For the ASCII (7bit/8bit) or ISO-8859-X character sets which are supported by the C string functions we have 256 characters. Before inserting marks for the stop characters we clear the whole table. The unrolled form is much faster than a loop. */ xorl %ecx, %ecx /* %ecx = 0 !!! */ pushl %ecx /* make a 256 bytes long block filled with 0 */ pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl %ecx pushl $0 /* These immediate values make the label 2 */ pushl $0 /* to be aligned on a 16 byte boundary to */ pushl $0 /* get a better performance of the loop. */ pushl $0 pushl $0 pushl $0 /* For understanding the following code remember that %ecx == 0 now. Although all the following instruction only modify %cl we always have a correct zero-extended 32-bit value in %ecx. */ L2: movb (%eax), %cl /* get byte from stopset */ testb %cl, %cl /* is NUL char? */ jz L1 /* yes => start compare loop */ movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */ movb 1(%eax), %cl /* get byte from stopset */ testb $0xff, %cl /* is NUL char? */ jz L1 /* yes => start compare loop */ movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */ movb 2(%eax), %cl /* get byte from stopset */ testb $0xff, %cl /* is NUL char? */ jz L1 /* yes => start compare loop */ movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */ movb 3(%eax), %cl /* get byte from stopset */ addl $4, %eax /* increment stopset pointer */ movb %cl, (%esp,%ecx) /* set corresponding byte in stopset table */ testb $0xff, %cl /* is NUL char? */ jnz L2 /* no => process next dword from stopset */ L1: leal -4(%edx), %eax /* prepare loop */ /* We use a neat trick for the following loop. Normally we would have to test for two termination conditions 1. a character in the stopset was found and 2. the end of the string was found As a sign that the character is in the stopset we store its value in the table. The value of NUL is NUL so the loop terminates for NUL in every case. */ L3: addl $4, %eax /* adjust pointer for full loop round */ movb (%eax), %cl /* get byte from string */ testb %cl, (%esp,%ecx) /* is it contained in stopset? */ jz L4 /* no => start of token */ movb 1(%eax), %cl /* get byte from string */ testb %cl, (%esp,%ecx) /* is it contained in stopset? */ jz L5 /* no => start of token */ movb 2(%eax), %cl /* get byte from string */ testb %cl, (%esp,%ecx) /* is it contained in stopset? */ jz L6 /* no => start of token */ movb 3(%eax), %cl /* get byte from string */ testb %cl, (%esp,%ecx) /* is it contained in stopset? */ jnz L3 /* yes => start of loop */ incl %eax /* adjust pointer */ L6: incl %eax L5: incl %eax /* Now we have to terminate the string. */ L4: leal -4(%eax), %edx /* We use %EDX for the next run. */ L7: addl $4, %edx /* adjust pointer for full loop round */ movb (%edx), %cl /* get byte from string */ cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */ je L8 /* yes => return */ movb 1(%edx), %cl /* get byte from string */ cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */ je L9 /* yes => return */ movb 2(%edx), %cl /* get byte from string */ cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */ je L10 /* yes => return */ movb 3(%edx), %cl /* get byte from string */ cmpb %cl, (%esp,%ecx) /* is it contained in skipset? */ jne L7 /* no => start loop again */ incl %edx /* adjust pointer */ L10: incl %edx L9: incl %edx L8: /* Remove the stopset table. */ addl $256, %esp cmpl %eax, %edx je LreturnNULL /* There was no token anymore. */ movb $0, (%edx) /* Terminate string. */ /* Are we at end of string? */ cmpb $0, %cl je L11 incl %edx L11: /* Store the pointer to the next character. */ #ifdef USE_AS_STRTOK_R movl 12(%esp), %ecx movl %edx, (%ecx) #else # ifndef PIC movl %edx, save_ptr # else movl %edx, save_ptr@GOTOFF(%ebx) popl %ebx # endif #endif ret LreturnNULL: xorl %eax, %eax /* Store current pointer for next round. */ #ifdef USE_AS_STRTOK_R movl 12(%esp), %ecx movl %edx, (%ecx) #else # ifndef PIC movl %edx, save_ptr # else movl %edx, save_ptr@GOTOFF(%ebx) popl %ebx # endif #endif ret END (FUNCTION)