projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 3443cb26 | 1 | /* |
| 5e0ed952 | 2 | char id_util[] = "@(#)util.c 1.7"; |
| 3443cb26 DW |
3 | * |
| 4 | * utility routines | |
| 5 | */ | |
| 6 | ||
| 7 | #include <sys/types.h> | |
| 8 | #include <sys/stat.h> | |
| 9 | #include "fio.h" | |
| 10 | ||
| fe1e75aa | 11 | extern short ccntrl_, blzero_; |
| 3443cb26 | 12 | |
| fe1e75aa | 13 | ini_std(u,F,w) FILE *F; |
| 3443cb26 DW |
14 | { unit *p; |
| 15 | p = &units[u]; | |
| 16 | p->ufd = F; | |
| 17 | p->ufnm = NULL; | |
| 18 | p->useek = canseek(F); | |
| 19 | p->ufmt = YES; | |
| 20 | p->uwrt = (w==WRITE)? YES : NO; | |
| 656fbd79 | 21 | p->uscrtch = p->uend = NO; |
| 5e0ed952 DW |
22 | p->ublnk = blzero; |
| 23 | p->uprnt = ccntrl; | |
| 3443cb26 DW |
24 | p->url = 0; |
| 25 | p->uinode = finode(F); | |
| 26 | } | |
| 27 | ||
| 28 | canseek(f) FILE *f; /*SYSDEP*/ | |
| 29 | { struct stat x; | |
| 30 | return( (fstat(fileno(f),&x)==0) && | |
| 31 | (x.st_nlink > 0 /*!pipe*/) && !isatty(fileno(f)) ); | |
| 32 | } | |
| 33 | ||
| 34 | nowreading(x) unit *x; | |
| 35 | { | |
| ff26b80a | 36 | return(now_acc(x,"r")); |
| 3443cb26 DW |
37 | } |
| 38 | ||
| 39 | nowwriting(x) unit *x; | |
| ff26b80a DW |
40 | { |
| 41 | return(now_acc(x,"a")); | |
| 42 | } | |
| 43 | ||
| 44 | now_acc(x,mode) | |
| 45 | unit *x; char *mode; | |
| 3443cb26 DW |
46 | { |
| 47 | long loc; | |
| ff26b80a DW |
48 | |
| 49 | if (!x->ufnm) | |
| 50 | { | |
| 51 | errno = EBADF; | |
| 52 | return(NO); | |
| 53 | } | |
| 54 | if (x->useek) | |
| 55 | loc=ftell(x->ufd); | |
| 56 | if (freopen(x->ufnm,mode,x->ufd)) | |
| 57 | { | |
| 58 | if (x->useek) | |
| 59 | fseek(x->ufd,loc,0); | |
| 60 | x->uwrt = (*mode=='a'); | |
| 61 | return(YES); | |
| 62 | } | |
| 63 | if (x->ufd = fopen(x->ufnm, (*mode=='a')? "r":"a")) | |
| 64 | if (x->useek) | |
| 65 | fseek(x->ufd,loc,0); | |
| 66 | return(NO); | |
| 3443cb26 DW |
67 | } |
| 68 | ||
| 69 | g_char(a,alen,b) char *a,*b; ftnlen alen; | |
| 70 | { char *x=a+alen-1, *y=b+alen-1; | |
| 71 | while (x >= a && *x == ' ') {x--; y--;} | |
| 72 | *(y+1) = '\0'; | |
| 73 | while (x >= a) *y-- = *x--; | |
| 74 | } | |
| 75 | ||
| 76 | b_char(from, to, tolen) char *from, *to; ftnlen tolen; | |
| 77 | { int i=0; | |
| 78 | while (*from && i < tolen) { | |
| 79 | *to++ = *from++; | |
| 80 | i++; | |
| 81 | } | |
| 82 | while (i++ < tolen) | |
| 83 | *to++ = ' '; | |
| 84 | } | |
| 85 | ||
| 86 | inode(a) char *a; | |
| 87 | { struct stat x; | |
| 88 | if(stat(a,&x)==0) return(x.st_ino); | |
| 89 | else return(-1); | |
| 90 | } | |
| 91 | ||
| 92 | finode(f) FILE *f; | |
| 93 | { struct stat x; | |
| 94 | if(fstat(fileno(f),&x)==0) return(x.st_ino); | |
| 95 | else return(-1); | |
| 96 | } | |
| 97 | ||
| 98 | char | |
| 99 | last_char(f) FILE *f; | |
| 100 | { | |
| 101 | fseek(f,-2L,1); | |
| 102 | if(ftell(f)) return(getc(f)); | |
| 103 | else return('\n'); | |
| 104 | } |