From 0ee6d9274e221a6ad709f35b6808b696ea4157a8 Mon Sep 17 00:00:00 2001
From: Vasco Costa <vascomacosta@gmail.com>
Date: Sat, 23 Mar 2024 09:20:13 +0000
Subject: [PATCH] Add tail

---
 README.md         |   8 +++
 tail/.gitignore   |   6 ++
 tail/README.md    |   7 +++
 tail/bin/tail.bin | Bin 0 -> 13760 bytes
 tail/bin/tail.map | 157 ++++++++++++++++++++++++++++++++++++++++++++++
 tail/makefile     |  17 +++++
 tail/src/tail.c   |  93 +++++++++++++++++++++++++++
 7 files changed, 288 insertions(+)
 create mode 100644 tail/.gitignore
 create mode 100644 tail/README.md
 create mode 100644 tail/bin/tail.bin
 create mode 100644 tail/bin/tail.map
 create mode 100644 tail/makefile
 create mode 100644 tail/src/tail.c

diff --git a/README.md b/README.md
index a736e78..378da1d 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,14 @@ Usage: %s [-hn min-len] filename
 -n strings at least min-len long (default: 4)
 ```
 
+### tail
+
+```
+Usage: %s [-hn] filename
+-h show this help message
+-n print the last n lines (default: 10)
+```
+
 ### wc
 
 ```
diff --git a/tail/.gitignore b/tail/.gitignore
new file mode 100644
index 0000000..75ceac6
--- /dev/null
+++ b/tail/.gitignore
@@ -0,0 +1,6 @@
+obj/
+src/gfx/*.c
+src/gfx/*.h
+src/gfx/*.8xv
+.DS_Store
+convimg.out
diff --git a/tail/README.md b/tail/README.md
new file mode 100644
index 0000000..03ab638
--- /dev/null
+++ b/tail/README.md
@@ -0,0 +1,7 @@
+# The tail utility for MOS on the Agon Light computer
+
+```
+Usage: %s [-hn] filename
+-h show this help message
+-n print the last n lines (default: 10)
+```
diff --git a/tail/bin/tail.bin b/tail/bin/tail.bin
new file mode 100644
index 0000000000000000000000000000000000000000..e3dd722f3f3364ad3fc0c592742e705e1664c191
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diff --git a/tail/bin/tail.map b/tail/bin/tail.map
new file mode 100644
index 0000000..10b5791
--- /dev/null
+++ b/tail/bin/tail.map
@@ -0,0 +1,157 @@
+Section     Base   Top    High   Length
+----------- ------ ------ ------ -------
+.libs       0B0045 0B0045             0h
+.init       0B0045 0B0079            34h
+.fini       0B0079 0B00BF            46h
+.init.args  0B00BF 0B00D5            16h
+.init.bss   0B00D5 0B00E1             Ch
+.text       0B00E1 0B336E          328Dh
+.data       0B336E 0B33B3            45h
+.rodata     0B33B3 0B35C0           20Dh
+.init_array 000000 000000             0h
+.ctors      000000 000000             0h
+.dtors      000000 000000             0h
+.fini_array 000000 000000             0h
+.bss        080000 080031 09FFFF     31h
+.header     0B0000 0B0045            45h
+
+Label                    Value
+----------------------   ------
+___low_bss             = 080000
+___len_bss             = 000031
+___heaptop             = 09FFFF
+___heapbot             = 080031
+___init_array_count    = 000000
+___ctors_count         = 000000
+___dtors_count         = 000000
+___fini_array_count    = 000000
+__stack                = 0AFFFF
+__fcmp                 = 0B00E1
+_inchar                = 0B00FE
+__setflag              = 0B0105
+___arg_processing      = 0B0114
+___parse_args          = 0B0135
+___check_redirect      = 0B0218
+___close_redir_files   = 0B0409
+_.str                  = 0B33B3
+_.str.1                = 0B33B5
+_.str.2                = 0B33B7
+__frameset             = 0B0452
+__frameset0            = 0B0460
+__iand                 = 0B046B
+__idivu                = 0B0484
+__idvrms               = 0B048C
+__idvrmu               = 0B04BA
+__imulu                = 0B04D2
+__indcallhl            = 0B0502
+__ineg                 = 0B0503
+__ior                  = 0B050C
+__irems                = 0B0525
+__ishl                 = 0B052D
+__ishrs                = 0B0558
+__ishru                = 0B0553
+__ixor                 = 0B0594
+__ladd                 = 0B05AD
+__land                 = 0B05B3
+__lcmps                = 0B05CE
+__lcmpu                = 0B05DB
+__lcmpzero             = 0B05E3
+__lladd                = 0B05EB
+__lland                = 0B060F
+__llcmpu               = 0B064C
+__llcmpzero            = 0B0676
+__llctlz               = 0B068B
+__lldivs               = 0B06A3
+__lldivu               = 0B06F3
+__lldvrmu              = 0B0707
+__lldvrmu.hijack       = 0B070E
+__llmulu               = 0B0765
+__llneg                = 0B07BA
+__llshl                = 0B07D3
+__llshrs.hijack_llshru = 0B0801
+__llshrs.finish        = 0B0820
+__llshru               = 0B0824
+__llsub                = 0B083E
+__lmulu                = 0B0860
+__lneg                 = 0B08BC
+__lshrs.hijack_lshru   = 0B08D5
+__lshru                = 0B08E4
+_atoi                  = 0B08F4
+_fclose                = 0B0907
+_fgetc                 = 0B094B
+_fgets                 = 0B0A2A
+__stdio_init           = 0B0ABD
+_stdin                 = 0B336E
+_stdout                = 0B3373
+_stderr                = 0B3378
+__file_streams         = 080000
+_fopen                 = 0B0B0F
+___fmodeflags          = 0B0BD0
+_.str                  = 0B33B9
+_fputc                 = 0B0C37
+_fput_char             = 0B0CC7
+_free                  = 0B0CEE
+_fseek                 = 0B0DAB
+_fwrite                = 0B0E54
+_malloc                = 0B0F28
+__alloc_base           = 080028
+___maptab              = 0B33BD
+_npf_vpprintf          = 0B0FC7
+JTI0_0                 = 0B343D
+JTI0_1                 = 0B345B
+JTI0_2                 = 0B34A0
+JTI0_3                 = 0B34C1
+JTI0_4                 = 0B34D9
+JTI0_5                 = 0B34F1
+_npf_utoa_rev          = 0B2731
+_printf                = 0B27F9
+_vprintf               = 0B2818
+_npf_putc_std          = 0B2838
+_.str                  = 0B3509
+_.str.1                = 0B350D
+_.str.2                = 0B3511
+_strtol                = 0B2848
+_isspace               = 0B2A41
+_outchar               = 0B2A58
+_putchar               = 0B2A5F
+_puts                  = 0B2A8E
+___null_literal_str    = 0B3515
+___end_of_line_str     = 0B351C
+_sbrk                  = 0B2ABA
+__sbrkbase             = 0B337D
+_toupper               = 0B2AD8
+_strchr                = 0B2AE5
+_strcmp                = 0B2B02
+_strlen                = 0B2B1F
+_strncmp               = 0B2B34
+_errno                 = 08002E
+_mos_fopen             = 0B2DC7
+_mos_fclose            = 0B2DDF
+_mos_fgetc             = 0B2DF4
+_mos_fputc             = 0B2E09
+_mos_fwrite            = 0B2F0D
+_mos_flseek            = 0B2F29
+_mos_getfil            = 0B2F48
+_freopen               = 0B2FDE
+_ungetc                = 0B3028
+__start                = 0B0045
+_exit                  = 0B007B
+skip._abort            = 0B00B3
+_exit.sp               = 0B00B4
+_clear_bss             = 0B00D5
+_parse_params          = 0B00BF
+argv_ptrs              = 0B3380
+_atexit                = 0B3065
+exit_functions         = 0B33B0
+_show_usage            = 0B3091
+_show_lines            = 0B30BB
+___main_argc_argv      = 0B321A
+_.str                  = 0B351E
+_.str.3                = 0B3539
+_.str.4                = 0B353C
+_.str.5                = 0B353F
+_.str.6                = 0B3542
+_.str.7                = 0B3567
+_.str.8                = 0B3569
+_str                   = 0B357C
+_str.9                 = 0B3597
diff --git a/tail/makefile b/tail/makefile
new file mode 100644
index 0000000..1902d7e
--- /dev/null
+++ b/tail/makefile
@@ -0,0 +1,17 @@
+# ----------------------------
+# Makefile Options
+# ----------------------------
+
+NAME = tail
+DESCRIPTION = "The tail utility for Agon"
+COMPRESSED = NO
+INIT_LOC = 0B0000
+LDHAS_EXIT_HANDLER:=0
+LDHAS_ARG_PROCESSING = 1
+
+CFLAGS = -Wall -Wextra -Oz
+CXXFLAGS = -Wall -Wextra -Oz
+
+# ----------------------------
+
+include $(shell cedev-config --makefile)
diff --git a/tail/src/tail.c b/tail/src/tail.c
new file mode 100644
index 0000000..1ef800d
--- /dev/null
+++ b/tail/src/tail.c
@@ -0,0 +1,93 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void show_usage(char *prog_name)
+{
+	printf("Usage: %s [-hn] filename\r\n", prog_name);
+	printf("-h show this help message\r\n");
+	printf("-n print the last n lines (default: 10)\r\n");
+}
+
+void show_lines(FILE *file, int lines)
+{
+	char **buf = malloc(sizeof(char *) * lines);
+
+	for (int i = 0; i < lines; i++)
+		buf[i] = malloc(sizeof(char) * 1024);
+
+	int lc = 0;
+
+	while (fgets(buf[lc % lines], 1024, file) != NULL)
+	{
+		lc++;
+	}
+
+	int start = lc > lines ? lc % lines : 0;
+	int count = lc > lines ? lines : lc;
+
+	for (int i = 0; i < count; i++)
+	{
+		printf("%s", buf[(start + i) % lines]);
+	}
+
+	for (int i = 0; i < lines; i++)
+		free(buf[i]);
+
+	free(buf);
+}
+
+int main(int argc, char *argv[])
+{
+	FILE *file = NULL;
+	char *filename = NULL;
+	int parsed_lines = 0;
+	size_t lines = 10;
+
+	for (int i = 1; i != argc; i++)
+	{
+		if (strcmp(argv[i], "-h") == 0)
+		{
+			show_usage(argv[0]);
+			return 0;
+		}
+		else if (strncmp(argv[i], "-n", 2) == 0)
+		{
+			parsed_lines = atoi(argv[++i]);
+
+			if (parsed_lines <= 0)
+			{
+				fprintf(stderr, "The number of lines must be positive");
+				return 1;
+			}
+
+			lines = parsed_lines;
+		}
+		else if (!filename)
+		{
+			filename = argv[i];
+		}
+		else
+		{
+			show_usage(argv[0]);
+			return 0;
+		}
+	}
+
+	if (filename == NULL)
+	{
+		show_usage(argv[0]);
+		return 0;
+	}
+
+	if (!(file = fopen(filename, "r")))
+	{
+		fprintf(stderr, "Error opening file");
+		return 1;
+	}
+
+	show_lines(file, lines);
+	fclose(file);
+
+	return 0;
+}
\ No newline at end of file