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1.1 root 1: /*
2: * build0.c
3: * 07/11/92
4: * Routines common to build and install.
5: */
6:
7: #include <stdio.h>
8: #include <sys/stat.h>
9: #include "build0.h"
10:
11: /* Globals. */
12: int abortmsg; /* print abort message */
13: char *argv0; /* for error messages */
14: char buf[NBUF]; /* input buffer */
15: char cmd[NBUF]; /* command buffer */
16: int dflag; /* debug */
17: char *usagemsg; /* usage message */
18: int vflag; /* verbose */
19:
20: /*
21: * Clear the IBM AT console screen.
22: * Prompt for <Enter> if the flag is true or if dflag.
23: */
24: void
25: cls(flag) register int flag;
26: {
27: if (flag || dflag)
28: get_line("\Hit <Enter> to continue...");
29: putchar(0x1B); /* ESC */
30: putchar('[');
31: putchar('2');
32: putchar('J');
33: fflush(stdout);
34: }
35:
36: /*
37: * Return 1 if file exists, 0 if not.
38: */
39: int
40: exists(file) register char *file;
41: {
42: register int fd;
43:
44: if ((fd = open(file, 0)) < 0)
45: return 0;
46: close(fd);
47: return 1;
48: }
49:
50: /*
51: * Print a fatal error message.
52: * Print "Installation aborted..." message if invoked from build or install.
53: */
54: void
55: fatal(s) char *s;
56: {
57: fprintf(stderr, "%s: %r\n", argv0, &s);
58: if (abortmsg)
59: fprintf(stderr, "Installation aborted before completion.\n");
60: exit(1);
61: }
62:
63: /*
64: * Get an integer value in the given range.
65: */
66: /* VARARGS */
67: int
68: get_int(min, max, prompt) int min, max; char *prompt;
69: {
70: register char *s;
71: register int i;
72:
73: s = get_line("%r", &prompt);
74: for (;;) {
75: if (*s >= '0' && *s <= '9') {
76: i = atoi(s);
77: if (i >= min && i <= max)
78: return i;
79: }
80: get_line("Enter a value between %d and %d:", min, max);
81: }
82: }
83:
84: /*
85: * Print the args and get a line from the user to buf[].
86: * Strip the trailing newline and return a pointer to the first non-space.
87: */
88: /* VARARGS */
89: char *
90: get_line(args) char *args;
91: {
92: register char *s;
93:
94: printf("%r ", &args);
95: fflush(stdout);
96: fgets(buf, sizeof buf, stdin);
97: buf[strlen(buf) - 1] = '\0';
98: for (s = buf; ; ++s)
99: if (*s != ' ' && *s != '\t')
100: return s;
101: }
102:
103: /*
104: * Return:
105: * 1 dir exists and is a directory,
106: * 0 dir does not exist,
107: * or -1 dir exists but is not a directory.
108: */
109: int
110: is_dir(dir) register char *dir;
111: {
112: struct stat s;
113:
114: if (stat(dir, &s) == -1)
115: return 0; /* does not exist */
116: return (s.st_mode & S_IFDIR) ? 1 : -1; /* directory or nondirectory */
117: }
118:
119: /*
120: * Print a nonfatal error message.
121: * Make sure the user sees it by waiting until he hits <Enter>.
122: */
123: void
124: nonfatal(s) char *s;
125: {
126: fprintf(stderr, "%s: %r\n", argv0, &s);
127: get_line("\Hit <Enter> to continue...");
128: }
129:
130: /*
131: * Execute the given command and return its exit status.
132: * The flag tells what to do if the command returns an error status:
133: * S_IGNORE ignore it
134: * S_NONFATAL report it
135: * S_FATAL report it and die
136: */
137: int
138: sys(command, flag) char *command; int flag;
139: {
140: register int status;
141:
142: if (dflag || vflag)
143: printf("%s\n", command);
144: if (dflag)
145: return 0;
146: if ((status = system(command)) != 0) {
147: if (flag == S_NONFATAL)
148: nonfatal("command \"%s\" failed", command);
149: else if (flag == S_FATAL)
150: fatal("command \"%s\" failed", command);
151: }
152: sync();
153: return status;
154: }
155:
156: /*
157: * Print a usage message and die.
158: */
159: void
160: usage()
161: {
162: fprintf(stderr, usagemsg);
163: exit(1);
164: }
165:
166: /*
167: * Get the answer to a yes/no question.
168: * Return 1 for yes, 0 for no.
169: */
170: /* VARARGS */
171: int
172: yes_no(args) char *args;
173: {
174: register char *s;
175:
176: for (;;) {
177: printf("%r", &args);
178: s = get_line(" [y or n]?");
179: if (*s == 'y' || *s == 'Y')
180: return 1;
181: else if (*s == 'n' || *s == 'N')
182: return 0;
183: }
184: }
185:
186: /* end of build0.c */
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