# 2.11BSD#431 - /usr/src/usr.bin/patch/dist/util.c

##### Functions

    ask               X
    copy_file         X
    fatal             X
    fetchname         X
    ignore_signals    X
    makedirs          X
    move_file         X
    savestr           X
    say               X
    set_signals       X

       1: #include "EXTERN.h"
       2: #include "common.h"
       3: #include "INTERN.h"
       4: #include "util.h"
       5:
       6: /* Rename a file, copying it if necessary. */
       7:
       8: int
       9: move_file(from,to)
      10: char *from, *to;
      11: {
      12:     char bakname[512];
      13:     Reg1 char *s;
      14:     Reg2 int i;
      15:     Reg3 int fromfd;
      16:
      17:     /* to stdout? */
      18:
      19:     if (strEQ(to, "-")) {
      20: #ifdef DEBUGGING
      21:     if (debug & 4)
      22:         say2("Moving %s to stdout.\n", from);
      23: #endif
      24:     fromfd = open(from, 0);
      25:     if (fromfd < 0)
      26:         fatal2("patch: internal error, can't reopen %s\n", from);
      27:     while ((i=read(fromfd, buf, sizeof buf)) > 0)
      28:         if (write(1, buf, i) != 1)
      29:         fatal1("patch: write failed\n");
      30:     Close(fromfd);
      31:     return 0;
      32:     }
      33:
      34:     if (origprae) {
      35:         Strcpy (bakname, origprae);
      36:         Strcat(bakname, to);
      37:     } else {
      38:         Strcpy(bakname, to);
      39:         Strcat(bakname, origext?origext:ORIGEXT);
      40:     }
      41:     if (stat(to, &filestat) >= 0) { /* output file exists */
      42:     dev_t to_device = filestat.st_dev;
      43:     ino_t to_inode  = filestat.st_ino;
      44:     char *simplename = bakname;
      45:
      46:     for (s=bakname; *s; s++) {
      47:         if (*s == '/')
      48:         simplename = s+1;
      49:     }
      50:     /* find a backup name that is not the same file */
      51:     while (stat(bakname, &filestat) >= 0 &&
      52:         to_device == filestat.st_dev && to_inode == filestat.st_ino) {
      53:         for (s=simplename; *s && !islower(*s); s++) ;
      54:         if (*s)
      55:         *s = toupper(*s);
      56:         else
      57:         Strcpy(simplename, simplename+1);
      58:     }
      59:     while (unlink(bakname) >= 0) ;  /* while() is for benefit of Eunice */
      60: #ifdef DEBUGGING
      61:     if (debug & 4)
      62:         say3("Moving %s to %s.\n", to, bakname);
      63: #endif
      64:     if (link(to, bakname) < 0) {
      65:         say3("patch: can't backup %s, output is in %s\n",
      66:         to, from);
      67:         return -1;
      68:     }
      69:     while (unlink(to) >= 0) ;
      70:     }
      71: #ifdef DEBUGGING
      72:     if (debug & 4)
      73:     say3("Moving %s to %s.\n", from, to);
      74: #endif
      75:     if (link(from, to) < 0) {       /* different file system? */
      76:     Reg4 int tofd;
      77:
      78:     tofd = creat(to, 0666);
      79:     if (tofd < 0) {
      80:         say3("patch: can't create %s, output is in %s.\n",
      81:           to, from);
      82:         return -1;
      83:     }
      84:     fromfd = open(from, 0);
      85:     if (fromfd < 0)
      86:         fatal2("patch: internal error, can't reopen %s\n", from);
      87:     while ((i=read(fromfd, buf, sizeof buf)) > 0)
      88:         if (write(tofd, buf, i) != i)
      89:         fatal1("patch: write failed\n");
      90:     Close(fromfd);
      91:     Close(tofd);
      92:     }
      93:     Unlink(from);
      94:     return 0;
      95: }
      96:
      97: /* Copy a file. */
      98:
      99: void
     100: copy_file(from,to)
     101: char *from, *to;
     102: {
     103:     Reg3 int tofd;
     104:     Reg2 int fromfd;
     105:     Reg1 int i;
     106:
     107:     tofd = creat(to, 0666);
     108:     if (tofd < 0)
     109:     fatal2("patch: can't create %s.\n", to);
     110:     fromfd = open(from, 0);
     111:     if (fromfd < 0)
     112:     fatal2("patch: internal error, can't reopen %s\n", from);
     113:     while ((i=read(fromfd, buf, sizeof buf)) > 0)
     114:     if (write(tofd, buf, i) != i)
     115:         fatal2("patch: write (%s) failed\n", to);
     116:     Close(fromfd);
     117:     Close(tofd);
     118: }
     119:
     120: /* Allocate a unique area for a string. */
     121:
     122: char *
     123: savestr(s)
     124: Reg1 char *s;
     125: {
     126:     Reg3 char *rv;
     127:     Reg2 char *t;
     128:
     129:     if (!s)
     130:     s = "Oops";
     131:     t = s;
     132:     while (*t++);
     133:     rv = malloc((MEM) (t - s));
     134:     if (rv == Nullch) {
     135:     if (using_plan_a)
     136:         out_of_mem = TRUE;
     137:     else
     138:         fatal1("patch: out of memory (savestr)\n");
     139:     }
     140:     else {
     141:     t = rv;
     142:     while (*t++ = *s++);
     143:     }
     144:     return rv;
     145: }
     146:
     147: #if defined(lint) && defined(CANVARARG)
     148:
     149: /*VARARGS ARGSUSED*/
     150: say(pat) char *pat; { ; }
     151: /*VARARGS ARGSUSED*/
     152: fatal(pat) char *pat; { ; }
     153: /*VARARGS ARGSUSED*/
     154: ask(pat) char *pat; { ; }
     155:
     156: #else
     157:
     158: /* Vanilla terminal output (buffered). */
     159:
     160: void
     161: say(pat,arg1,arg2,arg3)
     162: char *pat;
     163: long arg1,arg2,arg3;
     164: {
     165:     fprintf(stderr, pat, arg1, arg2, arg3);
     166:     Fflush(stderr);
     167: }
     168:
     169: /* Terminal output, pun intended. */
     170:
     171: void                /* very void */
     172: fatal(pat,arg1,arg2,arg3)
     173: char *pat;
     174: long arg1,arg2,arg3;
     175: {
     176:     void my_exit();
     177:
     178:     say(pat, arg1, arg2, arg3);
     179:     my_exit(1);
     180: }
     181:
     182: /* Get a response from the user, somehow or other. */
     183:
     184: void
     185: ask(pat,arg1,arg2,arg3)
     186: char *pat;
     187: long arg1,arg2,arg3;
     188: {
     189:     int ttyfd;
     190:     int r;
     191:     bool tty2 = isatty(2);
     192:
     193:     Sprintf(buf, pat, arg1, arg2, arg3);
     194:     Fflush(stderr);
     195:     write(2, buf, strlen(buf));
     196:     if (tty2) {             /* might be redirected to a file */
     197:     r = read(2, buf, sizeof buf);
     198:     }
     199:     else if (isatty(1)) {       /* this may be new file output */
     200:     Fflush(stdout);
     201:     write(1, buf, strlen(buf));
     202:     r = read(1, buf, sizeof buf);
     203:     }
     204:     else if ((ttyfd = open("/dev/tty", 2)) >= 0 && isatty(ttyfd)) {
     205:                     /* might be deleted or unwriteable */
     206:     write(ttyfd, buf, strlen(buf));
     207:     r = read(ttyfd, buf, sizeof buf);
     208:     Close(ttyfd);
     209:     }
     210:     else if (isatty(0)) {       /* this is probably patch input */
     211:     Fflush(stdin);
     212:     write(0, buf, strlen(buf));
     213:     r = read(0, buf, sizeof buf);
     214:     }
     215:     else {              /* no terminal at all--default it */
     216:     buf[0] = '\n';
     217:     r = 1;
     218:     }
     219:     if (r <= 0)
     220:     buf[0] = 0;
     221:     else
     222:     buf[r] = '\0';
     223:     if (!tty2)
     224:     say1(buf);
     225: }
     226: #endif /* lint */
     227:
     228: /* How to handle certain events when not in a critical region. */
     229:
     230: void
     231: set_signals(reset)
     232: int reset;
     233: {
     234:     void my_exit();
     235: #ifndef lint
     236: #ifdef VOIDSIG
     237:     static void (*hupval)(),(*intval)();
     238: #else
     239:     static int (*hupval)(),(*intval)();
     240: #endif
     241:
     242:     if (!reset) {
     243:     hupval = signal(SIGHUP, SIG_IGN);
     244:     if (hupval != SIG_IGN)
     245:         hupval = my_exit;
     246:     intval = signal(SIGINT, SIG_IGN);
     247:     if (intval != SIG_IGN)
     248:         intval = my_exit;
     249:     }
     250:     Signal(SIGHUP, hupval);
     251:     Signal(SIGINT, intval);
     252: #endif
     253: }
     254:
     255: /* How to handle certain events when in a critical region. */
     256:
     257: void
     258: ignore_signals()
     259: {
     260: #ifndef lint
     261:     Signal(SIGHUP, SIG_IGN);
     262:     Signal(SIGINT, SIG_IGN);
     263: #endif
     264: }
     265:
     266: /* Make sure we'll have the directories to create a file. */
     267:
     268: void
     269: makedirs(filename,striplast)
     270: Reg1 char *filename;
     271: bool striplast;
     272: {
     273:     char tmpbuf[256];
     274:     Reg2 char *s = tmpbuf;
     275:     char *dirv[20];
     276:     Reg3 int i;
     277:     Reg4 int dirvp = 0;
     278:
     279:     while (*filename) {
     280:     if (*filename == '/') {
     281:         filename++;
     282:         dirv[dirvp++] = s;
     283:         *s++ = '\0';
     284:     }
     285:     else {
     286:         *s++ = *filename++;
     287:     }
     288:     }
     289:     *s = '\0';
     290:     dirv[dirvp] = s;
     291:     if (striplast)
     292:     dirvp--;
     293:     if (dirvp < 0)
     294:     return;
     295:     strcpy(buf, "mkdir");
     296:     s = buf;
     297:     for (i=0; i<=dirvp; i++) {
     298:     while (*s) s++;
     299:     *s++ = ' ';
     300:     strcpy(s, tmpbuf);
     301:     *dirv[i] = '/';
     302:     }
     303:     system(buf);
     304: }
     305:
     306: /* Make filenames more reasonable. */
     307:
     308: char *
     309: fetchname(at,strip_leading,assume_exists)
     310: char *at;
     311: int strip_leading;
     312: int assume_exists;
     313: {
     314:     char *s;
     315:     char *name;
     316:     Reg1 char *t;
     317:     char tmpbuf[200];
     318:
     319:     if (!at)
     320:     return Nullch;
     321:     s = savestr(at);
     322:     for (t=s; isspace(*t); t++) ;
     323:     name = t;
     324: #ifdef DEBUGGING
     325:     if (debug & 128)
     326:     say4("fetchname %s %d %d\n",name,strip_leading,assume_exists);
     327: #endif
     328:     if (strnEQ(name, "/dev/null", 9))   /* so files can be created by diffing */
     329:     return Nullch;          /*   against /dev/null. */
     330:     for (; *t && !isspace(*t); t++)
     331:     if (*t == '/')
     332:         if (--strip_leading >= 0)
     333:         name = t+1;
     334:     *t = '\0';
     335:     if (name != s && *s != '/') {
     336:     name[-1] = '\0';
     337:     if (stat(s, &filestat) && filestat.st_mode & S_IFDIR) {
     338:         name[-1] = '/';
     339:         name=s;
     340:     }
     341:     }
     342:     name = savestr(name);
     343:     Sprintf(tmpbuf, "RCS/%s", name);
     344:     free(s);
     345:     if (stat(name, &filestat) < 0 && !assume_exists) {
     346:     Strcat(tmpbuf, RCSSUFFIX);
     347:     if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+4, &filestat) < 0) {
     348:         Sprintf(tmpbuf, "SCCS/%s%s", SCCSPREFIX, name);
     349:         if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+5, &filestat) < 0) {
     350:         free(name);
     351:         name = Nullch;
     352:         }
     353:     }
     354:     }
     355:     return name;
     356: }

#### Defined functions

ask defined in line 184; never used
copy_file defined in line 99; never used
fatal defined in line 171; never used
fetchname defined in line 308; never used
ignore_signals defined in line 257; never used
makedirs defined in line 268; never used
move_file defined in line 8; never used
savestr defined in line 122; used 2 times

- in line 321, 342

say defined in line 160; used 1 times

- in line 178

set_signals defined in line 230; never used

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