diff options
Diffstat (limited to 'contrib/libf2c/libI77/backspace.c')
| -rw-r--r-- | contrib/libf2c/libI77/backspace.c | 139 |
1 files changed, 73 insertions, 66 deletions
diff --git a/contrib/libf2c/libI77/backspace.c b/contrib/libf2c/libI77/backspace.c index 8489239..c31e711 100644 --- a/contrib/libf2c/libI77/backspace.c +++ b/contrib/libf2c/libI77/backspace.c @@ -2,73 +2,80 @@ #include <sys/types.h> #include "f2c.h" #include "fio.h" -#ifdef KR_headers -integer f_back(a) alist *a; -#else -integer f_back(alist *a) -#endif -{ unit *b; - off_t v, w, x, y, z; - uiolen n; - FILE *f; +integer +f_back (alist * a) +{ + unit *b; + off_t v, w, x, y, z; + uiolen n; + FILE *f; - f__curunit = b = &f__units[a->aunit]; /* curunit for error messages */ - if (f__init & 2) - f__fatal (131, "I/O recursion"); - if(a->aunit >= MXUNIT || a->aunit < 0) - err(a->aerr,101,"backspace"); - if(b->useek==0) err(a->aerr,106,"backspace"); - if(b->ufd == NULL) { - fk_open(1, 1, a->aunit); - return(0); - } - if(b->uend==1) - { b->uend=0; - return(0); - } - if(b->uwrt) { - t_runc(a); - if (f__nowreading(b)) - err(a->aerr,errno,"backspace"); - } - f = b->ufd; /* may have changed in t_runc() */ - if(b->url>0) - { - x=FTELL(f); - y = x % b->url; - if(y == 0) x--; - x /= b->url; - x *= b->url; - FSEEK(f,x,SEEK_SET); - return(0); - } + f__curunit = b = &f__units[a->aunit]; /* curunit for error messages */ + if (f__init & 2) + f__fatal (131, "I/O recursion"); + if (a->aunit >= MXUNIT || a->aunit < 0) + err (a->aerr, 101, "backspace"); + if (b->useek == 0) + err (a->aerr, 106, "backspace"); + if (b->ufd == NULL) + { + fk_open (1, 1, a->aunit); + return (0); + } + if (b->uend == 1) + { + b->uend = 0; + return (0); + } + if (b->uwrt) + { + t_runc (a); + if (f__nowreading (b)) + err (a->aerr, errno, "backspace"); + } + f = b->ufd; /* may have changed in t_runc() */ + if (b->url > 0) + { + x = FTELL (f); + y = x % b->url; + if (y == 0) + x--; + x /= b->url; + x *= b->url; + FSEEK (f, x, SEEK_SET); + return (0); + } - if(b->ufmt==0) - { FSEEK(f,-(off_t)sizeof(uiolen),SEEK_CUR); - fread((char *)&n,sizeof(uiolen),1,f); - FSEEK(f,-(off_t)n-2*sizeof(uiolen),SEEK_CUR); - return(0); + if (b->ufmt == 0) + { + FSEEK (f, -(off_t) sizeof (uiolen), SEEK_CUR); + fread ((char *) &n, sizeof (uiolen), 1, f); + FSEEK (f, -(off_t) n - 2 * sizeof (uiolen), SEEK_CUR); + return (0); + } + w = x = FTELL (f); + z = 0; +loop: + while (x) + { + x -= x < 64 ? x : 64; + FSEEK (f, x, SEEK_SET); + for (y = x; y < w; y++) + { + if (getc (f) != '\n') + continue; + v = FTELL (f); + if (v == w) + { + if (z) + goto break2; + goto loop; + } + z = v; } - w = x = FTELL(f); - z = 0; - loop: - while(x) { - x -= x < 64 ? x : 64; - FSEEK(f,x,SEEK_SET); - for(y = x; y < w; y++) { - if (getc(f) != '\n') - continue; - v = FTELL(f); - if (v == w) { - if (z) - goto break2; - goto loop; - } - z = v; - } - err(a->aerr,(EOF),"backspace"); - } - break2: - FSEEK(f, z, SEEK_SET); - return 0; + err (a->aerr, (EOF), "backspace"); + } +break2: + FSEEK (f, z, SEEK_SET); + return 0; } |
