source: buchla-68k/orig/GEMDOS/NEWVER.C

Last change on this file was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Imported original source code.
  • Property mode set to 100755
File size: 4.1 KB
Line 
1/*
2 =============================================================================
3 newver.c -- read and update a GEMDOS version message object file
4 Version 1 -- 1988-10-28 -- D.N. Lynx Crowe
5 (c) Copyright 1988 -- D.N. Lynx Crowe -- All rights reserved
6
7 Compiled and linked with the GEMDOS Alcyon C developer's package.
8
9 NOTE: Because we use the Alcyon GEMDOS object file format,
10 which is specific to the Atari, this code is NON-PORTABLE.
11
12 The idea, however, is adaptable to a wide variety of systems
13 and object file formats.
14
15 Note also that the fopen() function in the Alcyon C library does not
16 support the "r+" option, making it necessary to close the file and
17 then open it again before writing. This is a serious shortcoming of
18 the Alcyon C library, as it makes updating files only possible by a
19 series of questionable maneuvers, (e.g. opening, closing, and reopening
20 the file, or using open(), then fdopen(), etc.).
21 =============================================================================
22*/
23
24#include "stdio.h" /* Atari GEMDOS standard I/O definitions */
25#include "stddefs.h" /* some usefull standard C definitions */
26#include "objdefs.h" /* GEMDOS object file definitions */
27
28#define VERFILE "verdate.o" /* version message file */
29
30extern int errno; /* system error code */
31
32extern char *now(); /* get formatted system date and time */
33
34FILE *fp; /* VERFILE file pointer */
35
36 /* 000000000011111111112 */
37 /* 012345678901234567890 */
38char dtg[22]; /* yyyy-mm-dd hh:mm:ss zero terminated string */
39
40 /* 000000000011 */
41 /* 012345678901 */
42char verstr[12]; /* yyyymmdd.vv zero terminated string */
43
44struct vb { /* VERFILE buffer (66 bytes) */
45
46 struct EXFILE hdr;
47 char ver[12];
48 struct SYMBOL sym;
49 char rem[12];
50
51} verbuf;
52
53/*
54
55*/
56
57/*
58 =============================================================================
59 read and update an Alcyon/GEMDOS format version message object file
60 =============================================================================
61*/
62
63main()
64{
65 short len, rc, vn, vp1, vp2;
66
67 len = sizeof verbuf;
68
69 /* first, read the old version message object file */
70
71 if ((FILE *)NULL EQ (fp = fopenb(VERFILE, "r"))) {
72
73 printf("ERROR -- Unable to open \"%s\" for reading (errno = %d)\n",
74 VERFILE, errno);
75
76 exit(1);
77 }
78
79 rewind(fp);
80
81 if (1 NE (rc = fread(&verbuf, len, 1, fp))) {
82
83 printf("ERROR -- Unable to read \"%s\" (rc = %d, errno = %d)\n",
84 VERFILE, rc, errno);
85
86 if (ferror(fp))
87 printf(" File system ERROR.\n");
88 else if (feof(fp))
89 printf(" Premature EOF.\n");
90 else
91 printf(" Neither ERROR or EOF set -- very odd\n");
92
93 fclose(fp);
94 exit(1);
95 }
96
97 fclose(fp);
98/*
99
100*/
101
102 /* next, set the date and version */
103
104 now(dtg); /* set date and time */
105
106 memcpy(&verstr[0], &dtg[0], 4);
107 memcpy(&verstr[4], &dtg[5], 2);
108 memcpy(&verstr[6], &dtg[8], 2);
109 strcpy(&verstr[8], ".01");
110
111 if (memcmp(verbuf.ver, verstr, 8)) { /* if date is different ... */
112
113 strcpy(verbuf.ver, verstr); /* ... it's today's 1st version */
114
115 } else { /* ... otherwise, it's today's next version */
116
117 vn = ((verbuf.ver[ 9] - '0') * 10) +
118 (verbuf.ver[10] - '0') + 1;
119
120 if (vn GE 100) { /* too many versions today ? */
121
122 printf("WARNING -- version number rolled over to 00.\n");
123 vn = 0;
124 }
125
126 vp1 = vn / 10;
127 vp2 = vn - (vp1 * 10);
128
129 verbuf.ver[ 9] = vp1 + '0';
130 verbuf.ver[10] = vp2 + '0';
131 }
132
133/*
134
135*/
136 /* finally, re-write the version message object file */
137
138 if ((FILE *)NULL EQ (fp = fopenb(VERFILE, "w"))) {
139
140 printf("ERROR -- Unable to open \"%s\" for writing (errno = %d)\n",
141 VERFILE, errno);
142
143 exit(1);
144 }
145
146 rewind(fp);
147
148 if (1 NE (rc = fwrite(&verbuf, len, 1, fp))) {
149
150 printf("ERROR -- Unable to write to \"%s\" (rc = %d, errno = %d)\n",
151 VERFILE, rc, errno);
152
153 if (ferror(fp))
154 printf(" File system ERROR.\n");
155 else if (feof(fp))
156 printf(" Premature EOF.\n");
157 else
158 printf(" Neither ERROR or EOF set -- very odd\n");
159
160 fclose(fp);
161 exit(1);
162 }
163
164 fclose(fp);
165 printf("Current version: %s\n", verbuf.ver);
166 exit(0);
167}
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