123375Smckusick /* 247540Skarels * Copyright (c) 1982, 1986, 1991 Regents of the University of California. 347540Skarels * All rights reserved. 423375Smckusick * 547540Skarels * %sccs.include.redist.c% 647540Skarels * 7*48016Smckusick * @(#)kern_subr.c 7.7 (Berkeley) 04/15/91 823375Smckusick */ 912792Ssam 1017093Sbloom #include "param.h" 1117093Sbloom #include "systm.h" 12*48016Smckusick #include "proc.h" 1312792Ssam 1437728Smckusick uiomove(cp, n, uio) 1512792Ssam register caddr_t cp; 1612792Ssam register int n; 1712792Ssam register struct uio *uio; 1812792Ssam { 1912792Ssam register struct iovec *iov; 2012792Ssam u_int cnt; 2112792Ssam int error = 0; 2212792Ssam 23*48016Smckusick 24*48016Smckusick #ifdef DIAGNOSTIC 2537728Smckusick if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE) 2637728Smckusick panic("uiomove: mode"); 27*48016Smckusick if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc) 28*48016Smckusick panic("uiomove proc"); 29*48016Smckusick #endif 3012792Ssam while (n > 0 && uio->uio_resid) { 3112792Ssam iov = uio->uio_iov; 3212792Ssam cnt = iov->iov_len; 3312792Ssam if (cnt == 0) { 3412792Ssam uio->uio_iov++; 3512792Ssam uio->uio_iovcnt--; 3612792Ssam continue; 3712792Ssam } 3812792Ssam if (cnt > n) 3912792Ssam cnt = n; 4012792Ssam switch (uio->uio_segflg) { 4112792Ssam 4216704Smckusick case UIO_USERSPACE: 4316704Smckusick case UIO_USERISPACE: 4437728Smckusick if (uio->uio_rw == UIO_READ) 4512792Ssam error = copyout(cp, iov->iov_base, cnt); 4612792Ssam else 4712792Ssam error = copyin(iov->iov_base, cp, cnt); 4812792Ssam if (error) 4912792Ssam return (error); 5012792Ssam break; 5112792Ssam 5216704Smckusick case UIO_SYSSPACE: 5337728Smckusick if (uio->uio_rw == UIO_READ) 5412792Ssam bcopy((caddr_t)cp, iov->iov_base, cnt); 5512792Ssam else 5612792Ssam bcopy(iov->iov_base, (caddr_t)cp, cnt); 5712792Ssam break; 5812792Ssam } 5912792Ssam iov->iov_base += cnt; 6012792Ssam iov->iov_len -= cnt; 6112792Ssam uio->uio_resid -= cnt; 6212792Ssam uio->uio_offset += cnt; 6312792Ssam cp += cnt; 6412792Ssam n -= cnt; 6512792Ssam } 6612792Ssam return (error); 6712792Ssam } 6812792Ssam 6912792Ssam /* 7012792Ssam * Give next character to user as result of read. 7112792Ssam */ 7212792Ssam ureadc(c, uio) 7312792Ssam register int c; 7412792Ssam register struct uio *uio; 7512792Ssam { 7612792Ssam register struct iovec *iov; 7712792Ssam 7812792Ssam again: 7912792Ssam if (uio->uio_iovcnt == 0) 8012792Ssam panic("ureadc"); 8112792Ssam iov = uio->uio_iov; 8212792Ssam if (iov->iov_len <= 0 || uio->uio_resid <= 0) { 8312792Ssam uio->uio_iovcnt--; 8412792Ssam uio->uio_iov++; 8512792Ssam goto again; 8612792Ssam } 8712792Ssam switch (uio->uio_segflg) { 8812792Ssam 8916704Smckusick case UIO_USERSPACE: 9012792Ssam if (subyte(iov->iov_base, c) < 0) 9112792Ssam return (EFAULT); 9212792Ssam break; 9312792Ssam 9416704Smckusick case UIO_SYSSPACE: 9512792Ssam *iov->iov_base = c; 9612792Ssam break; 9712792Ssam 9816704Smckusick case UIO_USERISPACE: 9912792Ssam if (suibyte(iov->iov_base, c) < 0) 10012792Ssam return (EFAULT); 10112792Ssam break; 10212792Ssam } 10312792Ssam iov->iov_base++; 10412792Ssam iov->iov_len--; 10512792Ssam uio->uio_resid--; 10612792Ssam uio->uio_offset++; 10712792Ssam return (0); 10812792Ssam } 10912792Ssam 11040810Smarc strcat(src, append) 11140810Smarc register char *src, *append; 11240810Smarc { 11340810Smarc 11440810Smarc for (; *src; ++src) 11547540Skarels ; 11640810Smarc while (*src++ = *append++) 11747540Skarels ; 11840810Smarc } 11940810Smarc 12040810Smarc strcpy(to, from) 12140810Smarc register char *to, *from; 12240810Smarc { 12340810Smarc 12440810Smarc for (; *from = *to; ++from, ++to) 12547540Skarels ; 12640810Smarc } 12740810Smarc 12840810Smarc strncpy(to, from, cnt) 12940810Smarc register char *to, *from; 13040810Smarc register int cnt; 13140810Smarc { 13240810Smarc 13340810Smarc for (; cnt && (*to = *from); --cnt, ++from, ++to) 13447540Skarels ; 13540810Smarc *to = '\0'; 13640810Smarc } 13740810Smarc 13847540Skarels #ifndef lint /* unused except by ct.c, other oddities XXX */ 13912792Ssam /* 14012792Ssam * Get next character written in by user from uio. 14112792Ssam */ 14212792Ssam uwritec(uio) 14312792Ssam struct uio *uio; 14412792Ssam { 14512792Ssam register struct iovec *iov; 14612792Ssam register int c; 14712792Ssam 14827235Skarels if (uio->uio_resid <= 0) 14927235Skarels return (-1); 15012792Ssam again: 15127235Skarels if (uio->uio_iovcnt <= 0) 15212792Ssam panic("uwritec"); 15312792Ssam iov = uio->uio_iov; 15412792Ssam if (iov->iov_len == 0) { 15512792Ssam uio->uio_iov++; 15627235Skarels if (--uio->uio_iovcnt == 0) 15727235Skarels return (-1); 15812792Ssam goto again; 15912792Ssam } 16012792Ssam switch (uio->uio_segflg) { 16112792Ssam 16216704Smckusick case UIO_USERSPACE: 16312792Ssam c = fubyte(iov->iov_base); 16412792Ssam break; 16512792Ssam 16616704Smckusick case UIO_SYSSPACE: 16747540Skarels c = *(u_char *) iov->iov_base; 16812792Ssam break; 16912792Ssam 17016704Smckusick case UIO_USERISPACE: 17112792Ssam c = fuibyte(iov->iov_base); 17212792Ssam break; 17312792Ssam } 17412792Ssam if (c < 0) 17512792Ssam return (-1); 17612792Ssam iov->iov_base++; 17712792Ssam iov->iov_len--; 17812792Ssam uio->uio_resid--; 17912792Ssam uio->uio_offset++; 18047540Skarels return (c); 18112792Ssam } 18240810Smarc #endif /* notdef */ 183