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Merge pull request #1620 from SvenMichaelKlose/pixel_strnlen

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Add standard C library function strnlen().
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Bob Andrews 2022-01-29 21:32:27 +01:00 committed by GitHub
commit 6332f090d9
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4 changed files with 91 additions and 0 deletions
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1
include/string.h
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@ -78,6 +78,7 @@ int __fastcall__ stricmp (const char* s1, const char* s2); /* DOS/Windows */
int __fastcall__ strcasecmp (const char* s1, const char* s2); /* Same for Unix */
int __fastcall__ strnicmp (const char* s1, const char* s2, size_t count); /* DOS/Windows */
int __fastcall__ strncasecmp (const char* s1, const char* s2, size_t count); /* Same for Unix */
size_t __fastcall__ strnlen (const char* s, size_t maxlen); /* POSIX.1-2008 */
char* __fastcall__ strlwr (char* s);
char* __fastcall__ strlower (char* s);
char* __fastcall__ strupr (char* s);

54
libsrc/common/strnlen.s Normal file
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@ -0,0 +1,54 @@
; size_t __fastcall__ strnlen (const char* s, size_t maxlen);
.export _strnlen
.import popax
.importzp ptr1, tmp1, tmp2, tmp3, tmp4
.proc _strnlen
; Get maximum length.
tay
iny
sty tmp3
inx
stx tmp4
; Fetch string pointer.
jsr popax
sta ptr1
stx ptr1+1
; Clear return value.
ldy #0
sty tmp1
sty tmp2
;;; Loop over string.
; Decrement maximum length.
next: dec tmp3
bne l2
dec tmp4
beq done
l2:
lda (ptr1),y
beq done
; Step to next character.
iny
bne l1
inc ptr1+1
l1:
; Increment return value.
inc tmp1
bne next
inc tmp2
bne next ; (jmp)
done: lda tmp1
ldx tmp2
rts
.endproc

4
targettest/Makefile
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@ -160,6 +160,7 @@ EXELIST_c64 = \
scanf-test \
ser-test \
strdup-test \
strnlen \
stroserror-test \
strqtok-test \
tinyshell \
@ -190,6 +191,7 @@ EXELIST_vic20 = \
rename-test \
scanf-test \
strdup-test \
strnlen \
stroserror-test \
strqtok-test \
tinyshell \
@ -222,6 +224,7 @@ EXELIST_apple2 = \
seek \
ser-test \
strdup-test \
strnlen \
stroserror-test \
strqtok-test \
tinyshell \
@ -257,6 +260,7 @@ EXELIST_atari = \
seek \
ser-test \
strdup-test \
strnlen \
stroserror-test \
strqtok-test \
tinyshell \

32
targettest/strnlen.c Normal file
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@ -0,0 +1,32 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
const char * str = "0123456789";
void
check (size_t result, size_t expected)
{
if (result != expected) {
printf ("Expected strnlen() to return %u, got %u.\n",
expected, result);
exit (EXIT_FAILURE);
}
}
int
main (void)
{
size_t maxlen = strlen (str);
size_t result;
size_t expected;
for (expected = 0; expected < maxlen; expected++)
check (strnlen (str, expected), expected);
check (strnlen (str, maxlen << 1), maxlen);
printf ("strnlen() OK.\n");
return EXIT_SUCCESS;
}