toybox: lib/functions.c annotate

annotate lib/functions.c @ 49:bb4c38853a7d

xopen() wants 2 arguments unless you're creating a file, in which case you need 3. Doing varargs for this doesn't really appeal to me (bugs in waiting) so I made an xcreate() that takes 3 args, and had xopen() call it with 0 for the third argument. That way, if we feed O_CREAT to xopen() the permission 000 result should be easy to spot.

author	Rob Landley <rob@landley.net>
date	Sun, 07 Jan 2007 22:51:12 -0500
parents	e74aa8b8660a
children	63c168b65fa6

rev	line source
3 266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	1 /* vi: set sw=4 ts=4 :*/
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	2 /* functions.c - reusable stuff.
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	3 *
3 266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	4 * Functions with the x prefix are wrappers for library functions. They either
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	5 * succeed or kill the program with an error message, but never return failure.
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	6 * They usually have the same arguments and return value as the function they
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	7 * wrap.
7 fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	8 *
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	9 * Copyright 2006 Rob Landley <rob@landley.net>
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	10 */
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	11
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	12 #include "toys.h"
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	13
7 fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	14 void verror_msg(char *msg, int err, va_list va)
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	15 {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	16 fprintf(stderr, "%s: ", toys.which->name);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	17 vfprintf(stderr, msg, va);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	18 if (err) fprintf(stderr, ": %s", strerror(err));
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	19 putc('\n', stderr);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	20 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	21
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	22 void error_msg(char *msg, ...)
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	23 {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	24 va_list va;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	25
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	26 va_start(va, msg);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	27 verror_msg(msg, 0, va);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	28 va_end(va);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	29 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	30
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	31 void perror_msg(char *msg, ...)
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	32 {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	33 va_list va;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	34
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	35 va_start(va, msg);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	36 verror_msg(msg, errno, va);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	37 va_end(va);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	38 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	39
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	40 // Die with an error message.
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	41 void error_exit(char *msg, ...)
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	42 {
7 fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	43 va_list va;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	44
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	45 va_start(va, msg);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	46 verror_msg(msg, 0, va);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	47 va_end(va);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	48
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	49 exit(toys.exitval);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	50 }
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	51
7 fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	52 // Die with an error message and strerror(errno)
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	53 void perror_exit(char *msg, ...)
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	54 {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	55 va_list va;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	56
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	57 va_start(va, msg);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	58 verror_msg(msg, errno, va);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	59 va_end(va);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	60
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	61 exit(toys.exitval);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	62 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	63
3 266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	64 // Like strncpy but always null terminated.
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	65 void strlcpy(char dest, char src, size_t size)
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	66 {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	67 strncpy(dest,src,size);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	68 dest[size-1] = 0;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	69 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	70
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	71 // Die unless we can allocate memory.
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	72 void *xmalloc(size_t size)
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	73 {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	74 void *ret = malloc(size);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	75 if (!ret) error_exit("xmalloc");
3 266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	76
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	77 return ret;
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	78 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	79
3 266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	80 // Die unless we can allocate prezeroed memory.
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	81 void *xzalloc(size_t size)
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	82 {
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	83 void *ret = xmalloc(size);
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	84 bzero(ret,size);
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	85 return ret;
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	86 }
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	87
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	88 // Die unless we can change the size of an existing allocation, possibly
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	89 // moving it. (Notice different arguments from libc function.)
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	90 void xrealloc(void **ptr, size_t size)
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	91 {
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	92 ptr = realloc(ptr, size);
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	93 if (!*ptr) error_exit("xrealloc");
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	94 }
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	95
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	96 // Die unless we can allocate a copy of this many bytes of string.
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	97 void xstrndup(char s, size_t n)
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	98 {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	99 void *ret = xmalloc(++n);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	100 strlcpy(ret, s, n);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	101
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	102 return ret;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	103 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	104
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	105 // Die unless we can allocate a copy of this string.
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	106 void xstrdup(char s)
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	107 {
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	108 return xstrndup(s,strlen(s));
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	109 }
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	110
4 732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	111 // Die unless we can allocate enough space to sprintf() into.
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	112 char xmsprintf(char format, ...)
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	113 {
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	114 va_list va;
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	115 int len;
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	116 char *ret;
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	117
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	118 // How long is it?
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	119
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	120 va_start(va, format);
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	121 len = vsnprintf(0, 0, format, va);
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	122 len++;
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	123 va_end(va);
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	124
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	125 // Allocate and do the sprintf()
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	126 ret = xmalloc(len);
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	127 va_start(va, format);
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	128 vsnprintf(ret, len, format, va);
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	129 va_end(va);
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	130
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	131 return ret;
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	132 }
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	133
3 266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	134 // Die unless we can exec argv[] (or run builtin command). Note that anything
266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	135 // with a path isn't a builtin, so /bin/sh won't match the builtin sh.
7 fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	136 void xexec(char **argv)
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	137 {
3 266a462ed18c Next drop of toysh, plus more infratructure. landley@driftwood parents: 2 diff changeset	138 toy_exec(argv);
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	139 execvp(argv[0], argv);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	140 error_exit("No %s", argv[0]);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	141 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	142
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	143 // Die unless we can open/create a file, returning file descriptor.
49 bb4c38853a7d xopen() wants 2 arguments unless you're creating a file, in which case you Rob Landley <rob@landley.net> parents: 44 diff changeset	144 int xcreate(char *path, int flags, int mode)
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	145 {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	146 int fd = open(path, flags, mode);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	147 if (fd == -1) error_exit("No file %s\n", path);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	148 return fd;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	149 }
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	150
49 bb4c38853a7d xopen() wants 2 arguments unless you're creating a file, in which case you Rob Landley <rob@landley.net> parents: 44 diff changeset	151 // Die unless we can open a file, returning file descriptor.
bb4c38853a7d xopen() wants 2 arguments unless you're creating a file, in which case you Rob Landley <rob@landley.net> parents: 44 diff changeset	152 int xopen(char *path, int flags)
bb4c38853a7d xopen() wants 2 arguments unless you're creating a file, in which case you Rob Landley <rob@landley.net> parents: 44 diff changeset	153 {
bb4c38853a7d xopen() wants 2 arguments unless you're creating a file, in which case you Rob Landley <rob@landley.net> parents: 44 diff changeset	154 return xcreate(path, flags, 0);
bb4c38853a7d xopen() wants 2 arguments unless you're creating a file, in which case you Rob Landley <rob@landley.net> parents: 44 diff changeset	155 }
bb4c38853a7d xopen() wants 2 arguments unless you're creating a file, in which case you Rob Landley <rob@landley.net> parents: 44 diff changeset	156
2 67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	157 // Die unless we can open/create a file, returning FILE *.
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	158 FILE xfopen(char path, char *mode)
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	159 {
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	160 FILE *f = fopen(path, mode);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	161 if (!f) error_exit("No file %s\n", path);
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	162 return f;
67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df. landley@driftwood parents: diff changeset	163 }
4 732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	164
8 04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	165 // Read from file handle, retrying if interrupted.
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	166 ssize_t reread(int fd, void *buf, size_t count)
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	167 {
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	168 ssize_t len;
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	169 for (;;) {
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	170 len = read(fd, buf, count);
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	171 if (len >= 0 \|\| errno != EINTR) return len;
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	172 }
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	173 }
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	174
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	175 // Keep reading until full or EOF
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	176 ssize_t readall(int fd, void *buf, size_t count)
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	177 {
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	178 size_t len = 0;
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	179 while (len<count) {
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	180 int i = reread(fd, buf, count);
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	181 if (!i) return len;
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	182 if (i<0) return i;
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	183 count += i;
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	184 }
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	185
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	186 return count;
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	187 }
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	188
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	189 // Die if we can't fill a buffer
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	190 void xread(int fd, char *buf, size_t count)
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	191 {
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	192 if (count != readall(fd, buf, count)) perror_exit("xread");
04f66da2bdbf Add reread(), readall(), and xread() on the bus ride in to work... landley@driftwood parents: 7 diff changeset	193 }
4 732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	194
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	195 char *xgetcwd(void)
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	196 {
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	197 char *buf = getcwd(NULL, 0);
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	198 if (!buf) error_exit("xgetcwd");
7 fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	199
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	200 return buf;
4 732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	201 }
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	202
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	203 // Cannonicalizes path by removing ".", "..", and "//" elements. This is not
44 e74aa8b8660a Comment tweak. Rob Landley <rob@landley.net> parents: 20 diff changeset	204 // the same as realpath(), where "dir/.." could wind up somewhere else by
e74aa8b8660a Comment tweak. Rob Landley <rob@landley.net> parents: 20 diff changeset	205 // following symlinks.
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	206 char xabspath(char path)
4 732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	207 {
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	208 char from, to;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	209
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	210 // If this isn't an absolute path, make it one with cwd.
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	211 if (path[0]!='/') {
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	212 char *cwd=xgetcwd();
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	213 path = xmsprintf("%s/%s",cwd,path);
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	214 free(cwd);
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	215 } else path = xstrdup(path);
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	216
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	217 // Loop through path elements
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	218 from = to = path;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	219 while (*from) {
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	220
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	221 // Continue any current path component.
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	222 if (*from!='/') {
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	223 (to++) = (from++);
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	224 continue;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	225 }
4 732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	226
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	227 // Skip duplicate slashes.
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	228 while (*from=='/') from++;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	229
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	230 // Start of a new filename. Handle . and ..
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	231 while (*from=='.') {
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	232 // Skip .
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	233 if (from[1]=='/') from += 2;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	234 else if (!from[1]) from++;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	235 // Back up for ..
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	236 else if (from[1]=='.') {
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	237 if (from[2]=='/') from +=3;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	238 else if(!from[2]) from+=2;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	239 else break;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	240 while (to>path && *(--to)!='/');
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	241 } else break;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	242 }
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	243 // Add directory separator slash.
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	244 *(to++) = '/';
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	245 }
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	246 *to = 0;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	247
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	248 return path;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	249 }
4 732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	250
20 3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	251 // Find all file in a colon-separated path with access type "type" (generally
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	252 // X_OK or R_OK). Returns a list of absolute paths to each file found, in
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	253 // order.
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	254
20 3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	255 struct string_list find_in_path(char path, char *filename)
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	256 {
20 3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	257 struct string_list *rlist = NULL;
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	258 char *cwd = xgetcwd();
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	259
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	260 for (;;) {
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	261 char *next = path ? index(path, ':') : NULL;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	262 int len = next ? next-path : strlen(path);
20 3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	263 struct string_list *rnext;
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	264 struct stat st;
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	265
20 3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	266 rnext = xmalloc(sizeof(void *) + strlen(filename)
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	267 + (len ? len : strlen(cwd)) + 2);
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	268 if (!len) sprintf(rnext->str, "%s/%s", cwd, filename);
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	269 else {
20 3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	270 char *res = rnext->str;
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	271 strncpy(res, path, len);
20 3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	272 res += len;
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	273 *(res++) = '/';
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	274 strcpy(res, filename);
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	275 }
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	276
20 3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	277 // Confirm it's not a directory.
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	278 if (!stat(rnext->str, &st) && S_ISREG(st.st_mode)) {
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	279 rnext->next = rlist;
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	280 rlist = rnext;
3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	281 } else free(rnext);
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	282
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	283 if (!next) break;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	284 path += len;
dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	285 path++;
4 732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	286 }
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	287 free(cwd);
732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	288
20 3981c96f9285 Implement which. Add hello world to menuconfig. Wrap the various applet main Rob Landley <rob@landley.net> parents: 16 diff changeset	289 return rlist;
16 dd10785b6532 Add xabspath(), is_file_type(), which_in_path(), and find_in_path(). Rob Landley <rob@landley.net> parents: 8 diff changeset	290
4 732b055e17f7 Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path(). landley@driftwood parents: 3 diff changeset	291 }
7 fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	292
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	293 // Convert unsigned int to ascii, writing into supplied buffer. A truncated
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	294 // result contains the first few digits of the result ala strncpy, and is
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	295 // always null terminated (unless buflen is 0).
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	296 void utoa_to_buf(unsigned n, char *buf, unsigned buflen)
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	297 {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	298 int i, out = 0;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	299
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	300 if (buflen) {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	301 for (i=1000000000; i; i/=10) {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	302 int res = n/i;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	303
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	304 if ((res \|\| out \|\| i == 1) && --buflen>0) {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	305 out++;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	306 n -= res*i;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	307 *buf++ = '0' + res;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	308 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	309 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	310 *buf = 0;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	311 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	312 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	313
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	314 // Convert signed integer to ascii, using utoa_to_buf()
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	315 void itoa_to_buf(int n, char *buf, unsigned buflen)
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	316 {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	317 if (buflen && n<0) {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	318 n = -n;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	319 *buf++ = '-';
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	320 buflen--;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	321 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	322 utoa_to_buf((unsigned)n, buf, buflen);
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	323 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	324
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	325 // This static buffer is used by both utoa() and itoa(), calling either one a
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	326 // second time will overwrite the previous results.
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	327 //
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	328 // The longest 32 bit integer is -2 billion plus a null terminator: 12 bytes.
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	329 // Note that int is always 32 bits on any remotely unix-like system, see
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	330 // http://www.unix.org/whitepapers/64bit.html for details.
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	331
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	332 static char itoa_buf[12];
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	333
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	334 // Convert unsigned integer to ascii, returning a static buffer.
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	335 char *utoa(unsigned n)
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	336 {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	337 utoa_to_buf(n, itoa_buf, sizeof(itoa_buf));
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	338
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	339 return itoa_buf;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	340 }
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	341
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	342 char *itoa(int n)
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	343 {
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	344 itoa_to_buf(n, itoa_buf, sizeof(itoa_buf));
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	345
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	346 return itoa_buf;
fc9c0503d5e2 Implement df. Add -Wall to build and fix up warnings. Add copyright notices. landley@driftwood parents: 4 diff changeset	347 }

Mercurial > hg > toybox

annotate lib/functions.c @ 49:bb4c38853a7d