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--- sd:int_12h_string_services [2026/02/07 02:39] – created - external edit 127.0.0.1
+++ sd:int_12h_string_services [2026/03/07 06:11] (current) – appledog
@@ Line 2: / Line 2: @@
 == Catalog
-    ; ============================================================================
+<code>
-    ; INT 12h - STRING SERVICES
+; ============================================================================
-    ; A library of string functions intended to support programming in assembly,
+; INT 12h - STRING SERVICES
-    ; or to be used by a higher level language implemented in assembly.
+; A library of string functions intended to support programming in assembly,
-    ; February 7th, 2026, 10:20AM -- passed all 85 tests on the SD-8516
+; or to be used by a higher level language implemented in assembly.
-    ; ============================================================================
+; February 7th, 2026, 10:20AM -- passed all 85 tests on the SD-8516
-    ; Function dispatch via AH register:
+; ============================================================================
-    ;   AH=00h: strlen - Get string length
+; Function dispatch via AH register:
-    ;   AH=01h: strcpy - Copy string
+;   AH=00h: strlen - Get string length
-    ;   AH=02h: strcmp - Compare strings
+;   AH=01h: strcpy - Copy string
-    ;   AH=03h: strcat - Concatenate strings
+;   AH=02h: strcmp - Compare strings
-    ;   AH=04h: atoi - ASCII to integer
+;   AH=03h: strcat - Concatenate strings
-    ;   AH=05h: itoa - Integer to ASCII
+;   AH=04h: atoi - ASCII to integer
-    ;   AH=06h: strupr - Convert to uppercase
+;   AH=05h: itoa - Integer to ASCII
-    ;   AH=07h: strlwr - Convert to lowercase
+;   AH=06h: strupr - Convert to uppercase
-    ;   AH=08h: strchr - Find character in string
+;   AH=07h: strlwr - Convert to lowercase
-    ;   AH=09h: strncpy - Copy n characters
+;   AH=08h: strchr - Find character in string
-    ;   AH=0Ah: strncmp - Compare n characters
+;   AH=09h: strncpy - Copy n characters
-    ;   AH=0Bh: strcmpi - Compare strings (case-insensitive)
+;   AH=0Ah: strncmp - Compare n characters
-    ;   AH=0Ch: conv_ch_to_uc - Convert single char to uppercase
+;   AH=0Bh: strcmpi - Compare strings (case-insensitive)
-    ;   AH=0Dh: conv_ch_to_lc - Convert single char to lowercase
+;   AH=0Ch: conv_ch_to_uc - Convert single char to uppercase
-    ;   AH=0Eh: test_uc_lc - Test if char is uppercase
+;   AH=0Dh: conv_ch_to_lc - Convert single char to lowercase
-    ;   AH=0Fh: isnum - Test if char is digit (0-9)
+;   AH=0Eh: test_uc_lc - Test if char is uppercase
-    ;   AH=10h: isalpha - Test if char is letter (A-Z, a-z)
+;   AH=0Fh: isnum - Test if char is digit (0-9)
-    ;   AH=11h: puthex - Print byte in AL as hex
+;   AH=10h: isalpha - Test if char is letter (A-Z, a-z)
-    ;   AH=12h: putbase - Print number in B in base CL
+;   AH=11h: puthex - Print byte in AL as hex
-    ;   AH=13h: print_fld_hex
+;   AH=12h: putbase - Print number in B in base CL
-    ; ============================================================================
+;   AH=13h: print_fld_hex
+;   AH=14h: beginswith (Test if string starts with prefix)
+;   AH=15h: endswith (Test if string ends with suffix)
+;   AH=16h: strstr (Find substring in string)
+;   AH=20h: htoi (hex ascii to int)
+;   AH=21h: itoh (int to hex ascii)
+;
+; ============================================================================
+</code>