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Last change
on this file was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.0 KB
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| 1 | .file "strcat.S" |
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| 2 | |
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| 3 | .section .text |
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| 4 | .global _strcat |
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| 5 | .type _strcat,@function |
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| 6 | _strcat: |
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| 7 | ;; On entry: r1 => Destination |
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| 8 | ;; r2 => Source |
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| 9 | #ifdef __RX_DISALLOW_STRING_INSNS__ |
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| 10 | mov r1, r4 ; Save a copy of the dest pointer. |
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| 11 | |
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| 12 | 1: mov.b [r4+], r5 ; Find the NUL byte at the end of R4. |
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| 13 | cmp #0, r5 |
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| 14 | bne 1b |
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| 15 | |
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| 16 | sub #1, r4 ; Move R4 back to point at the NUL byte. |
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| 17 | |
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| 18 | 2: mov.b [r2+], r5 ; Copy bytes from R2 to R4 until we reach a NUL byte. |
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| 19 | mov.b r5, [r4+] |
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| 20 | cmp #0, r5 |
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| 21 | bne 2b |
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| 22 | |
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| 23 | rts |
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| 24 | #else |
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| 25 | mov r1, r4 ; Save a copy of the dest pointer. |
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| 26 | mov r2, r5 ; Save a copy of the source pointer. |
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| 27 | |
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| 28 | mov #0, r2 ; Search for the NUL byte. |
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| 29 | mov #-1, r3 ; Limit on the number of bytes examined. |
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| 30 | suntil.b ; Find the end of the destination string. |
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| 31 | sub #1, r1 ; suntil.b leaves r1 pointing to the byte beyond the match. |
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| 32 | |
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| 33 | mov #-1, r3 ; Set a limit on the number of bytes copied. |
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| 34 | mov r5, r2 ; Restore the source pointer. |
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| 35 | smovu ; Copy source to destination |
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| 36 | |
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| 37 | mov r4, r1 ; Return the original dest pointer. |
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| 38 | rts |
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| 39 | #endif |
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| 40 | .size _strcat, . - _strcat |
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| 41 | |
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