projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 9d25673b C |
1 | /* utils.c: functions of general utility */ |
| 2 | ||
| 3 | #include <errno.h> | |
| 4 | #include <setjmp.h> | |
| 5 | #include "rc.h" | |
| 6 | #include "jbwrap.h" | |
| 7 | ||
| 8 | /* print error with line number on noninteractive shells (i.e., scripts) */ | |
| 9 | ||
| 10 | extern void pr_error(char *s) { | |
| 11 | if (s != NULL) { | |
| 12 | if (interactive) | |
| 13 | fprint(2, "%s\n", s); | |
| 14 | else | |
| 15 | fprint(2, "line %d: %s\n", lineno - 1, s); | |
| 16 | } | |
| 17 | } | |
| 18 | ||
| 19 | /* our perror */ | |
| 20 | ||
| 21 | extern void uerror(char *s) { | |
| 22 | extern int sys_nerr; | |
| 23 | extern char *sys_errlist[]; | |
| 24 | if (errno > sys_nerr) | |
| 25 | return; | |
| 26 | if (s != NULL) | |
| 27 | fprint(2, "%s: %s\n", s, sys_errlist[errno]); | |
| 28 | else | |
| 29 | fprint(2, "%s\n", sys_errlist[errno]); | |
| 30 | } | |
| 31 | ||
| 32 | /* Die horribly. This should never get called. Please let me know if it does. */ | |
| 33 | ||
| 34 | #define PANICMSG "rc panic: " | |
| 35 | ||
| 36 | extern void panic(char *s) { | |
| 37 | write(2, PANICMSG, conststrlen(PANICMSG)); | |
| 38 | write(2, s, strlen(s)); | |
| 39 | write(2, "!\n", 2); | |
| 40 | exit(1); | |
| 41 | } | |
| 42 | ||
| 43 | /* ascii -> unsigned conversion routines. -1 indicates conversion error. */ | |
| 44 | ||
| 45 | extern int n2u(char *s, unsigned int base) { | |
| 46 | unsigned int i; | |
| 47 | for (i = 0; *s != '\0'; s++) { | |
| 48 | unsigned int j = (unsigned int) *s - '0'; | |
| 49 | if (j >= base) /* small hack with unsigned ints -- one compare for range test */ | |
| 50 | return -1; | |
| 51 | i = i * base + j; | |
| 52 | } | |
| 53 | return (int) i; | |
| 54 | } | |
| 55 | ||
| 56 | /* The last word in portable ANSI: a strcmp wrapper for qsort */ | |
| 57 | ||
| 58 | extern int starstrcmp(const void *s1, const void *s2) { | |
| 59 | return strcmp(*(char **)s1, *(char **)s2); | |
| 60 | } | |
| 61 | ||
| 62 | /* tests to see if pathname begins with "/", "./", or "../" */ | |
| 63 | ||
| 64 | extern bool isabsolute(char *path) { | |
| 65 | return path[0] == '/' || (path[0] == '.' && (path[1] == '/' || (path[1] == '.' && path[2] == '/'))); | |
| 66 | } | |
| 67 | ||
| 68 | /* signal-safe read and write (for BSD slow devices). writeall also allows partial writes */ | |
| 69 | ||
| 70 | extern void writeall(int fd, char *buf, size_t remain) { | |
| 71 | int i; | |
| 72 | for (i = 0; remain > 0; buf += i, remain -= i) { | |
| 73 | interrupt_happened = FALSE; | |
| 74 | if (!setjmp(slowbuf.j)) { | |
| 75 | slow = TRUE; | |
| 76 | if (interrupt_happened) | |
| 77 | break; | |
| 78 | else if ((i = write(fd, buf, remain)) <= 0) | |
| 79 | break; /* abort silently on errors in write() */ | |
| 80 | } else | |
| 81 | break; | |
| 82 | slow = FALSE; | |
| 83 | } | |
| 84 | slow = FALSE; | |
| 85 | SIGCHK; | |
| 86 | } | |
| 87 | ||
| 88 | extern int rc_read(int fd, char *buf, size_t n) { | |
| 89 | long /*ssize_t*/ r; | |
| 90 | interrupt_happened = FALSE; | |
| 91 | if (!setjmp(slowbuf.j)) { | |
| 92 | slow = TRUE; | |
| 93 | if (!interrupt_happened) | |
| 94 | r = read(fd, buf, n); | |
| 95 | else | |
| 96 | r = -2; | |
| 97 | } else | |
| 98 | r = -2; | |
| 99 | slow = FALSE; | |
| 100 | if (r == -2) { | |
| 101 | errno = EINTR; | |
| 102 | r = -1; | |
| 103 | } | |
| 104 | SIGCHK; | |
| 105 | return r; | |
| 106 | } | |
| 107 | ||
| 108 | /* clear out z bytes from character string s */ | |
| 109 | ||
| 110 | extern char *clear(char *s, size_t z) { | |
| 111 | while (z != 0) | |
| 112 | s[--z] = 0; | |
| 113 | return s; | |
| 114 | } | |
| 115 | ||
| 116 | /* duplicate a fd and close the old one only if necessary */ | |
| 117 | ||
| 118 | extern int mvfd(int i, int j) { | |
| 119 | if (i != j) { | |
| 120 | int s = dup2(i, j); | |
| 121 | close(i); | |
| 122 | return s; | |
| 123 | } | |
| 124 | return 0; | |
| 125 | } |