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/*
** 1998-08-02 - This module holds various utility functions sharing one common trait:
** they all deal with character strings in one way or another.
*/
#include "gentoo.h"
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "sizeutil.h"
#include "strutil.h"
/* ----------------------------------------------------------------------------------------- */
/* 1998-08-02 - Copy at most <n> bytes from <src> to <dst>, including the terminating
** '\0'-byte. If <src> is longer than <n-1>, it will be truncated with a
** '\0'-byte at position n-1. Example: stu_strncpy(b, "string", 1) would
** put a '\0'-byte at b[0] and return. Basically, think of the <n> as a
** limiter on the number of bytes at <dst> we're allowed to touch, and
** then fit a string-copying idea on top of that. :^) Works for me, and a
** lot better than the standard strncpy(), too. Returns <dst>.
*/
gchar * stu_strncpy(gchar *dst, const gchar *src, gssize n)
{
gchar *ret = dst;
if(dst && !src && n)
*dst = '\0';
else if(dst && src && (n >= 1))
{
for(n--; n > 0 && *src != '\0'; n--)
*dst++ = *src++;
*dst = '\0';
}
return ret;
}
/* ----------------------------------------------------------------------------------------- */
/* 2002-04-28 - Create a textual representation of <n>, with <tick> inserted every
** 3rd digit (counting from the right) into <buf>. Returns pointer to
** first digit.
** NOTE NOTE That <buf> pointer should point at one position past where the **last**
** character of the tickified number is to appear. This is for speed reasons.
*/
gchar * stu_tickify(gchar *buf, guint64 n, gchar tick)
{
register gint cnt = 0;
do
{
if(tick && cnt == 3)
*--buf = tick, cnt = 0;
*--buf = '0' + n % 10;
n /= 10;
cnt++;
} while(n);
return buf;
}
/* ----------------------------------------------------------------------------------------- */
/* 1999-09-11 - Return pointer to first occurance of <c> in <str>, disregarding case.
** If <c> cannot be found, NULL is returned. The string is not modified.
*/
const gchar * stu_strcasechr(const gchar *str, gchar c)
{
for(c = toupper((guchar) c); *str; str++)
{
if(toupper((guchar) *str) == c)
return str;
}
return NULL;
}
/* 1998-09-06 - This function has a silly name. It is used to get a pointer to the
** last occurance of the character <c> in the string <str>, ignoring case.
** It returns such a pointer, or NULL if <c> doesn't appear in <str>. The
** string being searched is not modified.
*/
const gchar * stu_strcaserchr(const gchar *str, gchar c)
{
const gchar *ptr;
gsize len;
if((len = strlen(str)) == 0)
return NULL;
for(c = toupper((guchar) c), ptr = str + len - 1; ptr >= str; ptr--)
if(toupper((guchar) *ptr) == c)
return ptr;
return NULL;
}
/* 1998-08-02 - Check if <string> ends with the suffix <suffix>. Note that this is fairly
** general; it does not assume (or require) <suffix> to begin with a period
** or any some such. If you want it to, include the period yourself. Returns
** 1 if there is indeed a suffix match, 0 otherwise.
** 1998-09-13 - Now handles suffixes of the ".tar.gz" kind, where the initial letter to
** match is NOT the last letter of its kind in the string. This made it a tad
** slower, sure, but hey.
*/
gboolean stu_has_suffix(const gchar *string, const gchar *suffix)
{
gssize len, sl;
if((string == NULL) || (suffix == NULL))
return FALSE;
len = strlen(string);
sl = strlen(suffix);
if(len < sl) /* String shorter than suffix? */
return FALSE;
return g_strcasecmp(string + len - sl, suffix) == 0;
}
/* ----------------------------------------------------------------------------------------- */
/* Attempt to find <string> in <vector> of strings. Returns vector index, or <default>. */
gint stu_strcmp_vector(const gchar *string, const gchar **vector, gsize vector_size, gint def)
{
gsize i;
for(i = 0; vector[i] && i < vector_size; i++)
{
if(strcmp(string, vector[i]) == 0)
return (gint) i;
}
return def;
}
/* ----------------------------------------------------------------------------------------- */
/* 1998-08-30 - Core glob->RE translator. Returns a pointer to a (dynamically allocated)
** piece of memory holding the RE. When done with that, please g_free() it.
*/
gchar * stu_glob_to_re(const gchar *glob)
{
GString *re;
gchar here, *ret;
const gchar *ptr, *end;
if((re = g_string_new(NULL)) == NULL)
return NULL;
for(ptr = glob; *ptr != '\0'; ptr++)
{
here = *ptr;
if(here == '[' && ptr[1] != ']') /* Character set begins? */
{
if((end = strchr(ptr + 1, ']')) != NULL)
{
for(; ptr <= end; ptr++)
g_string_append_c(re, *ptr);
ptr--;
}
}
else
{
switch(here)
{
case '.':
g_string_append(re, "\\.");
break;
case '*':
g_string_append(re, ".*");
break;
case '+':
g_string_append(re, "\\+");
break;
case '?':
g_string_append_c(re, '.');
break;
default:
g_string_append_c(re, here);
}
}
}
ret = re->str;
g_string_free(re, FALSE); /* Keeps the buffer. */
return ret;
}
/* 1998-08-30 - Translate a glob pattern into a System V8 regular expression. Thanks to the
** magic of GStrings, it will look to the caller as if the string is simply
** replaced by the translation. This code was moved from the good 'ol cmd_select
** module, since I wanted glob->RE translation in other places, too (types).
** This routine doesn't exactly fit in among the other, but since it deals with
** strings, I thought it could live here at least for a while.
*/
void stu_gstring_glob_to_re(GString *glob)
{
gchar *re;
if((re = stu_glob_to_re(glob->str)) != NULL)
{
g_string_assign(glob, re);
g_free(re);
}
}
/* ----------------------------------------------------------------------------------------- */
/* 1998-09-19 - Convert the protection <mode> to a (more) human-readable form stored at <buf>.
** Will not use more than <max> bytes of <buf>. Returns <buf>, or NULL on failure.
** 1999-01-05 - Finally sat down and experimentally deduced the way GNU 'ls' formats its mode
** strings, and did something similar here.
** 2000-09-14 - g_snprintf() is not scanf(). Remembered that.
*/
gchar * stu_mode_to_text(gchar *buf, gsize buf_max, mode_t mode)
{
gchar *grp[] = { "---", "--x", "-w-", "-wx", "r--", "r-x", "rw-", "rwx" };
gint u, g, o;
if(buf_max < 12) /* A lazy size limitation. */
return NULL;
u = (mode & S_IRWXU) >> 6;
g = (mode & S_IRWXG) >> 3;
o = (mode & S_IRWXO);
if(g_snprintf(buf, buf_max, "-%s%s%s", grp[u], grp[g], grp[o]) < 0)
return NULL;
/* Set the left-most character according to the file's intrinsic type. */
if(S_ISLNK(mode))
buf[0] = 'l';
else if(S_ISDIR(mode))
buf[0] = 'd';
else if(S_ISBLK(mode))
buf[0] = 'b';
else if(S_ISCHR(mode))
buf[0] = 'c';
else if(S_ISFIFO(mode))
buf[0] = 'p';
else if(S_ISSOCK(mode)) /* This is just a guess... */
buf[0] = 's';
/* This is magic until you understand how it works. The trick seems to be that one
** bit (e.g. "SETUID") is displayed on top of another bit (in this case user read)
** by changing that character either to 'S' (if it was not set) or 's' (if set).
** AFAIK, this is not documented anywhere (except perhaps in ls's source).
*/
if(mode & S_ISVTX) /* Sticky bit set? This is not POSIX... */
buf[9] = (buf[9] == '-') ? 'T' : 't';
if(mode & S_ISGID) /* Set GID bit set? */
buf[6] = (buf[6] == '-') ? 'S' : 's';
if(mode & S_ISUID) /* Set UID bit set? */
buf[3] = (buf[3] == '-') ? 'S' : 's';
return buf;
}
/* ----------------------------------------------------------------------------------------- */
/* 1998-10-07 - Scan a string from <def>, and put a pointer to a dynamically allocated version
** of it into <str>. The string should be delimited by double quotes. Characters
** (such as commas and whitespace) between strings are ignored. Returns a pointer
** to the beginning of the next string (suitable for a repeat call), or NULL when
** no more strings were found.
** 1999-02-24 - Added support for backslash escaping. Might be useful when this routine is used
** to scan strings which are then parsed by the command argument stuff. Or, you
** could just use single quotes of course...
*/
const gchar * stu_scan_string(const gchar *def, const gchar **str)
{
GString *tmp;
if((def == NULL) || (str == NULL))
return NULL;
while(*def && *def != '"')
def++;
if(*def == '"') /* Beginning of string actually found? */
{
def++;
if((tmp = g_string_new(NULL)) != NULL)
{
while(*def && *def != '"')
{
if(*def == '\\')
{
def++;
if(*def == '\0')
break;
}
g_string_append_c(tmp, *def++);
}
if(*def == '"') /* Closing quote here, too? */
{
*str = tmp->str;
g_string_free(tmp, FALSE);
return ++def; /* Then return with an OK status. */
}
g_string_free(tmp, TRUE);
}
}
return NULL;
}
/* ----------------------------------------------------------------------------------------- */
/* 1999-02-24 - Compute the length and content of the first word at <str>. Knows about
** quoting and backslash escapes. Stores word at <store>. Will typically be
** run twice on the same input, since you can't know how much space is going
** to be needed without running it once (with store == NULL).
** Quoting rules: A word can contain whitespace (space, tab) only if quoted.
** Double (") and single (') quotes can both be used, and have
** the same "power". One quotes the other, so "'" and '"' are
** both legal 1-character words. To include the quote used for
** a word IN the word, it must be backslash escaped: "\"" is
** the 1-character word ".
** Returns pointer to first character after word, or NULL if there are no more
** words. Stores word length at <len> (if non-NULL).
*/
const gchar * stu_word_length(const gchar *str, gsize *len, gchar *store)
{
gchar quote = 0, here;
gsize l = 0;
if(str == NULL)
return NULL;
while(*str && isspace((guchar) *str)) /* Skip inter-word spaces. */
str++;
if(*str == '\0')
return NULL;
for(; *str && !(quote == 0 && isspace((guchar) *str)); l++)
{
if((here = *str) == '\\') /* Backslash escapade? */
{
here = *++str;
if(here == '\0') /* At end of string? */
break;
}
else if(here == '\'' || here == '"')
{
if(quote == 0 || quote == here) /* Ignore "other" quote. */
{
if(quote == here)
quote = 0;
else
quote = here;
str++;
l--; /* Don't count the quote. */
continue; /* Avoid storing the quote. */
}
}
if(store != NULL)
*store++ = here;
str++;
}
if(quote != '\0' && *str == quote) /* Skip ending quote. */
str++;
if(len != NULL)
*len = l;
return str;
}
/* 1999-02-24 - This takes a string intended as a shell command and splits it into a word-
** vector as used by exec() functions. Think argv[]. Handles some quoting and
** escaped characters, too. The returned vector will be NULL-terminated, and
** can be freed by a single call to g_free().
*/
gchar ** stu_split_args(const gchar *argstring)
{
gsize wlen;
gint wtotlen, wnum, i;
const gchar *ptr = argstring;
gchar **argv, *store;
for(wnum = wlen = wtotlen = 0; (ptr = stu_word_length(ptr, &wlen, NULL)) != NULL; wnum++, wtotlen += wlen + 1)
;
if(wnum == 0) /* Nothing found? */
return NULL;
argv = g_malloc((wnum + 1) * sizeof *argv + wtotlen);
store = (gchar *) argv + (wnum + 1) * sizeof *argv;
for(ptr = (gchar *) argstring, i = 0; (ptr = stu_word_length(ptr, &wlen, store)) != NULL; i++)
{
argv[i] = store;
store[wlen] = '\0';
store += (wlen + 1);
}
argv[i] = NULL;
return argv;
}
/* ----------------------------------------------------------------------------------------- */
/* 2003-11-25 - Create internal (static, be careful!) version of <string> where certain
** characters have been escaped by backslashes, and return pointer to it.
*/
const gchar * stu_escape(const gchar *string)
{
static GString *str = NULL;
if(str == NULL)
str = g_string_new("");
else
g_string_truncate(str, 0);
for(; *string; string++)
{
if(*string == '"' || *string == '\'' || *string == '\\')
g_string_append_c(str, '\\');
g_string_append_c(str, *string);
}
return str->str;
}
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