sbase/uuencode.c

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C
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/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "util.h"
static void uuencode(FILE *, const char *, const char *);
static void
usage(void)
{
eprintf("usage: %s [file] name\n", argv0);
}
int
main(int argc, char *argv[])
{
FILE *fp;
ARGBEGIN {
case 'm':
eprintf("-m not implemented\n");
default:
usage();
} ARGEND;
if (argc == 0 || argc > 2)
usage();
if (argc == 1) {
uuencode(stdin, argv[0], "<stdin>");
} else {
if (!(fp = fopen(argv[0], "r")))
eprintf("fopen %s:", argv[0]);
uuencode(fp, argv[1], argv[0]);
fclose(fp);
}
return EXIT_SUCCESS;
}
static void
uuencode(FILE *fp, const char *name, const char *s)
{
struct stat st;
unsigned char buf[45], *p;
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ssize_t n;
int ch;
if (fstat(fileno(fp), &st) < 0)
eprintf("fstat %s:", s);
printf("begin %o %s\n", st.st_mode & 0777, name);
while ((n = fread(buf, 1, sizeof(buf), fp))) {
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ch = ' ' + (n & 0x3f);
putchar(ch == ' ' ? '`' : ch);
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for (p = buf; n > 0; n -= 3, p += 3) {
if (n < 3) {
p[2] = '\0';
if (n < 2)
p[1] = '\0';
}
ch = ' ' + ((p[0] >> 2) & 0x3f);
putchar(ch == ' ' ? '`' : ch);
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ch = ' ' + (((p[0] << 4) | ((p[1] >> 4) & 0xf)) & 0x3f);
putchar(ch == ' ' ? '`' : ch);
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ch = ' ' + (((p[1] << 2) | ((p[2] >> 6) & 0x3)) & 0x3f);
putchar(ch == ' ' ? '`' : ch);
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ch = ' ' + (p[2] & 0x3f);
putchar(ch == ' ' ? '`' : ch);
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}
putchar('\n');
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}
if (ferror(fp))
eprintf("'%s' read error:", s);
printf("%c\nend\n", '`');
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}