1 /*- 2 * Copyright (c) 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.proprietary.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)getlesson.c 8.1 (Berkeley) 06/06/93"; 10 #endif /* not lint */ 11 12 #include "stdio.h" 13 #include "lrnref.h" 14 #include "pathnames.h" 15 16 char * 17 getlesson() 18 { 19 register char *p; 20 char ans[80], line[200]; 21 int isnum, found, fd[2]; 22 FILE *fp; 23 24 sprintf(ans, "%s/%s/L%s", direct, sname, level); 25 if (access(ans, 04) == 0) /* there is a file */ 26 return(level); 27 isnum = 1; 28 for (p=level; *p; p++) /* accept: (digit|dot)*anychar */ 29 if (*p != '.' && (*p < '0' || *p > '9') && *(p+1) != '\0') 30 isnum = 0; 31 if (isnum) { 32 strcpy(line, level); 33 p = level; 34 while (*p != '.' && *p >= '0' && *p <= '9') 35 p++; 36 *p = '\0'; 37 strcat(level, ".1a"); 38 sprintf(ans, "%s/%s/L%s", direct, sname, level); 39 if (access(ans, 04) == 0) { /* there is a file */ 40 printf("There is no lesson %s; trying lesson %s instead.\n\n", line, level); 41 return(level); 42 } 43 printf("There is no lesson %s.\n", line); 44 return(0); 45 } 46 /* fgrep through lessons for one containing the string in 'level' */ 47 pipe(fd); 48 if (fork() == 0) { 49 close(fd[0]); 50 dup2(fd[1], 1); 51 sprintf(ans,"cd %s/%s ; fgrep '%s' L?.* L??.* L???.*", direct, sname, level); 52 execl(_PATH_CSHELL, "csh", "-cf", ans, 0); 53 perror(_PATH_CSHELL); 54 fprintf(stderr, "Getlesson: can't do %s\n", ans); 55 } 56 close(fd[1]); 57 fp = fdopen(fd[0], "r"); 58 found = 0; 59 while (fgets(line, 200, fp) != NULL) { 60 for (p=line; *p != ':'; p++) ; 61 p++; 62 if (*p == '#') 63 continue; 64 else { 65 found = 1; 66 break; 67 } 68 } 69 /*fclose(fp);*/ 70 if (found) { 71 *--p = '\0'; 72 strcpy(level, &line[1]); 73 sprintf(ans, "%s/%s/L%s", direct, sname, level); 74 if (access(ans, 04) == 0) { /* there is a file */ 75 printf("Trying lesson %s.\n\n", level); 76 return(level); 77 } 78 } 79 printf("There is no lesson containing \"%s\".\n", level); 80 return(0); 81 } 82