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Merge pull request #1620 from SvenMichaelKlose/pixel_strnlen
Add standard C library function strnlen().
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commit
6332f090d9
@ -78,6 +78,7 @@ int __fastcall__ stricmp (const char* s1, const char* s2); /* DOS/Windows */
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int __fastcall__ strcasecmp (const char* s1, const char* s2); /* Same for Unix */
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int __fastcall__ strcasecmp (const char* s1, const char* s2); /* Same for Unix */
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int __fastcall__ strnicmp (const char* s1, const char* s2, size_t count); /* DOS/Windows */
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int __fastcall__ strnicmp (const char* s1, const char* s2, size_t count); /* DOS/Windows */
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int __fastcall__ strncasecmp (const char* s1, const char* s2, size_t count); /* Same for Unix */
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int __fastcall__ strncasecmp (const char* s1, const char* s2, size_t count); /* Same for Unix */
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size_t __fastcall__ strnlen (const char* s, size_t maxlen); /* POSIX.1-2008 */
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char* __fastcall__ strlwr (char* s);
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char* __fastcall__ strlwr (char* s);
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char* __fastcall__ strlower (char* s);
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char* __fastcall__ strlower (char* s);
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char* __fastcall__ strupr (char* s);
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char* __fastcall__ strupr (char* s);
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54
libsrc/common/strnlen.s
Normal file
54
libsrc/common/strnlen.s
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@ -0,0 +1,54 @@
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; size_t __fastcall__ strnlen (const char* s, size_t maxlen);
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.export _strnlen
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.import popax
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.importzp ptr1, tmp1, tmp2, tmp3, tmp4
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.proc _strnlen
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; Get maximum length.
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tay
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iny
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sty tmp3
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inx
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stx tmp4
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; Fetch string pointer.
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jsr popax
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sta ptr1
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stx ptr1+1
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; Clear return value.
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ldy #0
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sty tmp1
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sty tmp2
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;;; Loop over string.
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; Decrement maximum length.
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next: dec tmp3
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bne l2
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dec tmp4
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beq done
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l2:
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lda (ptr1),y
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beq done
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; Step to next character.
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iny
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bne l1
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inc ptr1+1
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l1:
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; Increment return value.
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inc tmp1
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bne next
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inc tmp2
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bne next ; (jmp)
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done: lda tmp1
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ldx tmp2
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rts
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.endproc
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@ -160,6 +160,7 @@ EXELIST_c64 = \
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scanf-test \
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scanf-test \
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ser-test \
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ser-test \
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strdup-test \
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strdup-test \
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strnlen \
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stroserror-test \
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stroserror-test \
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strqtok-test \
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strqtok-test \
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tinyshell \
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tinyshell \
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@ -190,6 +191,7 @@ EXELIST_vic20 = \
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rename-test \
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rename-test \
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scanf-test \
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scanf-test \
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strdup-test \
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strdup-test \
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strnlen \
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stroserror-test \
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stroserror-test \
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strqtok-test \
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strqtok-test \
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tinyshell \
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tinyshell \
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@ -222,6 +224,7 @@ EXELIST_apple2 = \
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seek \
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seek \
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ser-test \
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ser-test \
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strdup-test \
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strdup-test \
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strnlen \
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stroserror-test \
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stroserror-test \
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strqtok-test \
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strqtok-test \
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tinyshell \
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tinyshell \
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@ -257,6 +260,7 @@ EXELIST_atari = \
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seek \
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seek \
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ser-test \
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ser-test \
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strdup-test \
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strdup-test \
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strnlen \
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stroserror-test \
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stroserror-test \
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strqtok-test \
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strqtok-test \
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tinyshell \
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tinyshell \
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32
targettest/strnlen.c
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32
targettest/strnlen.c
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@ -0,0 +1,32 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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const char * str = "0123456789";
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void
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check (size_t result, size_t expected)
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{
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if (result != expected) {
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printf ("Expected strnlen() to return %u, got %u.\n",
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expected, result);
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exit (EXIT_FAILURE);
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}
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}
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int
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main (void)
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{
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size_t maxlen = strlen (str);
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size_t result;
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size_t expected;
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for (expected = 0; expected < maxlen; expected++)
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check (strnlen (str, expected), expected);
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check (strnlen (str, maxlen << 1), maxlen);
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printf ("strnlen() OK.\n");
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return EXIT_SUCCESS;
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}
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