Читать онлайн «UNIX — универсальная среда программирования». Страница 182
Автор Керниган Брайан Уилсон
rm -f /tmp/put.[ab]$$3.8.46
readslow.c/* readslow: keep reading, waiting for more */#define SIZE 512 /* arbitrary */main() { char buf[SIZE]; int n; for (;;) { while ((n = read(0, buf, sizeof buf)) > 0) write(1, buf, n); sleep(10); }}3.8.47
replace# replace: replace str1 in files with str2, in placePATH=/bin:/usr/bincase $# in0|1|2) echo 'Usage: replace str1 str2 files' 1>&2; exit 1esacleft="$1"; right="$2"; shift; shiftfor ido overwrite $i sed "[email protected][email protected][email protected]" $idone3.8.48
signaltest.c#include <stdio.h>#include <signal.h>#include <errno.h>extern int errno;main() { int с, n; char buf[100]; int onintr(); signal(SIGINT, onintr); for (;;) { n = read(0, buf, 100); if (n > 0) printf(buf); else { if (errno == EINTR) { errno = 0; printf("interrupt side %d\n", n); } else { printf("true end of file %d\n", n); } } }}onintr() { signal(SIGINT, onintr); printf("interrupt\n");}3.8.49
spname.c/* spname: return correctly spelled filename *//* * spname(oldname, newname) char *oldname, *newname; * returns -1 if no reasonable match to oldname, * 0 if exact match, * 1 if corrected. * stores corrected name in newname. */#include <sys/types.h>#include <sys/dir.h>spname(oldname, newname) char *oldname, *newname;{ char *p, guess[DIRSIZ+1], best[DIRSIZ+1]; char *new = newname, *old = oldname; for (;;) { while (*old == '/') /* skip slashes */ *new++ = *old++; *new = '\0'; if (*old == '\0') /* exact or corrected */ return strcmp(oldname, newname) != 0; p = guess; /* copy next component into guess */ for ( ; *old != '/' && *old != '\0'; old++) if (p < guess+DIRSIZ) *p++ = *old; *p = '\0'; if (mindist(newname, guess, best) >= 3) return -1; /* hopeless */ for (p = best; *new = *p++; ) /* add to end */ new++; /* of newname */ }}mindist(dir, guess, best) /* search dir for guess */ char *dir, *guess, *best;{ /* set best, return distance 0..3 */ int d, nd, fd; struct { ino_t ino; char name[DIRSIZ+1]; /* 1 more than in dir.h */ } nbuf; nbuf.name[DIRSIZ] = '\0'; /* +1 for terminal '\0' */ if (dir[0] == '\0') /* current directory */ dir = "."; d = 3; /* minimum distance */ if ((fd=open(dir, 0)) == -1) return d; while (read(fd, (char*)&nbuf, sizeof(struct direct)) > 0)