minix3/commands/co/co.c

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2020-02-21 00:59:27 +05:30
/* co - check out Author: Peter S. Housel 12/24/87 */
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <pwd.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#define SUFFIX ",S" /* svc indicator */
#define SVCDIR "SVC" /* svc postfix indicator */
#define LINELEN 256 /* maximum line length */
#ifdef MAXPATHLEN
#define PATHLEN MAXPATHLEN
#else
#define PATHLEN 128 /* buffer length for filenames */
#endif
char file[PATHLEN]; /* file to be checked in */
char svc[PATHLEN]; /* filename for svc file */
char newsvc[PATHLEN]; /* new copy of SVC file */
char line[LINELEN]; /* temporary line buffer */
char *p; /* scratch character pointer */
FILE *svcfp; /* svc file */
int rev; /* old revision number */
int lastrev, lockrev; /* latest file revision, lock into */
int status; /* wait() buffer */
int svclock; /* lock the SVC file */
struct stat stb; /* stat() buffer */
char *base; /* basename of file */
char difftemp[PATHLEN]; /* extract() fix/patch input */
int main(int argc, char **argv);
void fname(char *src, char *dst);
void svcname(char *src, char *dst);
void extract(char *script, char *out, int rev);
char *basename(char *name);
char *whoami(void);
int getyn(void);
int main(argc, argv)
int argc;
char **argv;
{
#ifdef perprintf
char errbuf[BUFSIZ];
setbuf(stderr, errbuf);
perprintf(stderr);
#endif
while (++argv, --argc) {
if ('-' == (*argv)[0]) {
if ('r' == (*argv)[1]) {
--argc;
rev = atoi(*++argv);
if (rev < 1) {
fprintf(stderr, "Illegal revision number\n");
exit(1);
}
} else if ('l' == (*argv)[1])
++svclock;
else {
fprintf(stderr, "co: illegal option -%c\n", (*argv)[1]);
exit(1);
}
} else
break;
}
if (1 != argc) {
fprintf(stderr, "co: bad number of files arguments\n");
exit(1);
}
fname(*argv, file);
svcname(file, svc);
fprintf(stderr, "%s -> %s\n", svc, base = basename(file));
if (NULL == (svcfp = fopen(svc, "r"))) {
perror("co: can't read SVC file");
exit(1);
}
if (1 != fscanf(svcfp, "# %d", &lastrev) || lastrev < 1) {
fprintf(stderr, "co: illegal SVC file format\n");
exit(1);
}
fclose(svcfp);
if (stat(base, &stb) >= 0 && (stb.st_mode & 0222)) {
fprintf(stderr, "Writable %s exists - overwrite (n/y)? ", base);
if (!getyn()) {
fprintf(stderr, "Checkout aborted\n");
exit(1);
}
}
if (strlen(base)) unlink(base);
if (0 == rev) rev = lastrev;
fprintf(stderr, "Checking out revision %d", rev);
extract(svc, base, rev);
if (svclock) {
lockrev = lastrev + 1;
fprintf(stderr, "; Locking into revision %d\n", lockrev);
if (stat(svc, &stb) < 0 || chmod(svc, stb.st_mode | 0200) < 0)
perror("co: can't chmod SVC file");
if (stat(base, &stb) < 0 || chmod(base, stb.st_mode | 0200) < 0)
perror("co: can't chmod source file");
if (NULL == (svcfp = fopen(svc, "a"))
|| (fprintf(svcfp, "#***SVCLOCK*** %s %d\n", whoami(), lockrev), ferror(svcfp))) {
fprintf(stderr, "co: can't lock %s\n", svc);
exit(1);
}
if (stat(svc, &stb) < 0 || chmod(svc, stb.st_mode & 0555))
perror("co: can't chmod SVC file");
} else {
putchar('\n');
if (stat(base, &stb) < 0 || chmod(base, stb.st_mode & 0555))
perror("co: can't chmod source file");
}
return(0);
}
void fname(src, dst)
char *src, *dst;
{
char *p;
strcpy(dst, src);
p = &dst[strlen(src) - strlen(SUFFIX)];
if (!strcmp(p, SUFFIX)) *p = '\0';
}
void svcname(src, dst)
char *src, *dst;
{
char *p;
strcpy(dst, src);
strcat(dst, SUFFIX);
if (0 != access(dst, 4)) {
char dirname[PATHLEN];
if (NULL != (p = strrchr(src, '/')))
strncpy(dirname, src, (size_t)(p - src) + 1);
else
dirname[0] = '\0';
strcat(dirname, SVCDIR);
if (0 == access(dirname, 1)) {
strcpy(dst, dirname);
if (NULL == p) {
strcat(dst, "/");
strcat(dst, src);
} else
strcat(dst, p);
strcat(dst, SUFFIX);
}
}
}
void extract(script, out, rev)
char *script, *out;
int rev;
{
FILE *outfp;
int testrev;
char buf[80];
sprintf(difftemp, "Fix.%s", out);
svcfp = fopen(script, "r");
fgets(line, LINELEN, svcfp); /* skip '# rev' line */
fgets(line, LINELEN, svcfp); /* skip 'cat <***MAIN-eof***' line */
if (NULL == (outfp = fopen(out, "w"))) {
perror("co: can't create output file");
return;
}
while (NULL != fgets(line, LINELEN, svcfp) &&
strcmp(line, "***MAIN-eof***\n"))
fputs(line, outfp);
fclose(outfp);
while (NULL != fgets(line, LINELEN, svcfp)) {
if (!strncmp(line, "if ", (size_t)3)) {
sscanf(line, "if test $2 -ge %d", &testrev);
if (rev >= testrev) {
unlink(difftemp);
return;
}
if (NULL == (outfp = fopen(difftemp, "w"))) {
perror("co: can't create output file");
return;
}
sprintf(buf, "***%d-eof***\n", testrev);
while (NULL != fgets(line, LINELEN, svcfp) &&
strcmp(line, buf))
fputs(line, outfp);
fclose(outfp);
} else if (!strncmp(line, "mv ", (size_t)3)) {
sprintf(buf, "mv Fix.%s %s", out, out);
system(buf);
} else if (!strncmp(line, "fix ", (size_t)4)) {
sprintf(buf, "fix %s Fix.%s > New.%s; mv New.%s %s", out, out, out, out, out);
system(buf);
} else if (!strncmp(line, "patch ", (size_t)6)) {
sprintf(buf, "patch -n -s %s < Fix.%s; rm -f %s.orig", out, out, out);
system(buf);
} else { /* ignore */
}
}
unlink(difftemp);
return;
}
char *basename(name)
char *name;
{
char *p;
if (NULL == (p = strrchr(name, '/')))
return name;
else
return p + 1;
}
char *whoami()
{
struct passwd *pw;
if (NULL != (pw = getpwuid(getuid())))
return pw->pw_name;
else
return "nobody";
}
int getyn()
{
char ans[10];
return(NULL != fgets(ans, 10, stdin)) && ('y' == ans[0] || 'Y' == ans[0]);
}