/*
* Copyright (C) 2004-2007 Andre Noll <maan@systemlinux.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
*/
/** \file string.c memory allocation and string handling functions */
#include "string.h"
#include <sys/time.h> /* gettimeofday */
-#include <regex.h>
#include <pwd.h>
#include <sys/utsname.h> /* uname() */
#include <string.h>
* No need to check for NULL pointers: If p is NULL, the call
* to realloc is equivalent to malloc(size)
*/
+ assert(size);
if (!(p = realloc(p, size))) {
- PARA_EMERG_LOG("%s", "realloc failed, aborting\n");
+ PARA_EMERG_LOG("realloc failed (size = %zu), aborting\n",
+ size);
exit(EXIT_FAILURE);
}
return p;
*/
__must_check __malloc void *para_malloc(size_t size)
{
+ assert(size);
void *p = malloc(size);
if (!p) {
*
* A wrapper for calloc(3) which exits on errors.
*
- * A pointer to the allocated and zeroed-out memory, which is suitably aligned
- * for any kind of variable.
+ * \return A pointer to the allocated and zeroed-out memory, which is suitably
+ * aligned for any kind of variable.
*
* \sa calloc(3)
*/
*
* \param s string to be duplicated
*
- * A wrapper for strdup(3). It calls exit(EXIT_FAILURE) on errors, i.e. there
- * is no need to check the return value in the caller.
+ * A wrapper for strdup(3). It calls \p exit(EXIT_FAILURE) on errors, i.e.
+ * there is no need to check the return value in the caller.
*
* \return A pointer to the duplicated string. If \p s was the NULL pointer,
* an pointer to an empty string is returned.
return para_strdup(p);
}
-/**
- * simple search and replace routine
- *
- * \param src source string
- * \param macro_name the name of the macro
- * \param replacement the replacement format string
- *
- * In \p src, replace each occurence of \p macro_name(arg) by the string
- * determined by the \p replacement format string. \p replacement may (but
- * needs not) contain a single string conversion specifier (%s) which gets
- * replaced by \p arg.
- *
- * \return A string in which all matches in \p src are replaced, or \p NULL if
- * an syntax error was encountered. Caller must free the result.
- *
- * \sa regcomp(3)
- */
-__must_check __malloc char *s_a_r(const char *src, const char* macro_name,
- const char *replacement)
-{
- regex_t preg;
- size_t nmatch = 1;
- regmatch_t pmatch[1];
- int eflags = 0;
- char *dest = NULL;
- const char *bufptr = src;
-
- if (!macro_name || !replacement || !src)
- return para_strdup(src);
- regcomp(&preg, macro_name, 0);
- while (regexec(&preg, bufptr, nmatch, pmatch, eflags)
- != REG_NOMATCH) {
- char *tmp, *arg, *o_bracket, *c_bracket;
-
- o_bracket = strchr(bufptr + pmatch[0].rm_so, '(');
- c_bracket = o_bracket? strchr(o_bracket, ')') : NULL;
- if (!c_bracket)
- goto out;
- tmp = para_strdup(bufptr);
- tmp[pmatch[0].rm_so] = '\0';
- dest = para_strcat(dest, tmp);
- free(tmp);
-
- arg = para_strdup(o_bracket + 1);
- arg[c_bracket - o_bracket - 1] = '\0';
- tmp = make_message(replacement, arg);
- free(arg);
- dest = para_strcat(dest, tmp);
- free(tmp);
- bufptr = c_bracket;
- bufptr++;
- }
- dest = para_strcat(dest, bufptr);
-// PARA_DEBUG_LOG("%s: returning %s\n", __func__, dest);
-out:
- regfree(&preg);
- return dest;
-}
-
-/**
- * replace a string according to a list of macros
- *
- * \param macro_list the array containing a macro/replacement pairs.
- * \param src the source string
- *
- * This function just calls s_a_r() for each element of \p macro_list.
- *
- * \return \p NULL if one of the underlying calls to \p s_a_r returned \p NULL.
- * Otherwise the completely expanded version of \p src is returned.
- */
-__must_check __malloc char *s_a_r_list(struct para_macro *macro_list, char *src)
-{
- struct para_macro *mp = macro_list;
- char *ret = NULL, *tmp = para_strdup(src);
-
- while (mp->name) {
- ret = s_a_r(tmp, mp->name, mp->replacement);
- free(tmp);
- if (!ret) /* syntax error */
- return NULL;
- tmp = ret;
- mp++;
- }
- //PARA_DEBUG_LOG("%s: returning %s\n", __func__, dest);
- return ret;
-}
-
/**
* cut trailing newline
*
__must_check __malloc char *para_tmpname(void)
{
struct timeval now;
+ unsigned int seed;
+
gettimeofday(&now, NULL);
- srand(now.tv_usec);
+ seed = now.tv_usec;
+ srand(seed);
return make_message("%08i", rand());
}
* \param argv_ptr pointer to the list of substrings
* \param delim delimiter
*
- * This function modifies \p args by replacing each occurance of \p delim by
- * zero. A NULL-terminated array of pointers to char* is allocated dynamically
+ * This function modifies \a args by replacing each occurance of \a delim by
+ * zero. A \p NULL-terminated array of pointers to char* is allocated dynamically
* and these pointers are initialized to point to the broken-up substrings
- * within \p args. A pointer to this array is returned via \p argv_ptr. It's OK
- * to call this function with \p args \p == \p NULL.
+ * within \a args. A pointer to this array is returned via \a argv_ptr. It's OK
+ * to call this function with \a args \a == \p NULL.
*
- * \return The number of substrings found in \p args.
+ * \return The number of substrings found in \a args.
*/
__must_check unsigned split_args(char *args, char ***argv_ptr, const char *delim)
{
uname(&u);
return para_strdup(u.nodename);
}
+
+enum for_each_line_modes{LINE_MODE_RO, LINE_MODE_RW};
+
+static int for_each_complete_line(enum for_each_line_modes mode, char *buf,
+ size_t size, line_handler_t *line_handler, void *private_data)
+{
+ char *start = buf, *end;
+ int ret, i, num_lines = 0;
+
+// PARA_NOTICE_LOG("buf: %s\n", buf);
+ while (start < buf + size) {
+ char *next_null;
+ char *next_cr;
+
+ next_cr = memchr(start, '\n', buf + size - start);
+ next_null = memchr(start, '\0', buf + size - start);
+ if (!next_cr && !next_null)
+ break;
+ if (next_cr && next_null) {
+ end = next_cr < next_null? next_cr : next_null;
+ } else if (next_null) {
+ end = next_null;
+ } else
+ end = next_cr;
+ num_lines++;
+ if (!line_handler) {
+ start = ++end;
+ continue;
+ }
+ if (mode == LINE_MODE_RO) {
+ size_t s = end - start;
+ char *b = para_malloc(s + 1);
+ memcpy(b, start, s);
+ b[s] = '\0';
+// PARA_NOTICE_LOG("b: %s, start: %s\n", b, start);
+ ret = line_handler(b, private_data);
+ free(b);
+ } else {
+ *end = '\0';
+ ret = line_handler(start, private_data);
+ }
+ if (ret < 0)
+ return ret;
+ start = ++end;
+ }
+ if (!line_handler || mode == LINE_MODE_RO)
+ return num_lines;
+ i = buf + size - start;
+ if (i && i != size)
+ memmove(buf, start, i);
+ return i;
+}
+
+/**
+ * call a custom function for each complete line
+ *
+ * \param buf the buffer containing data seperated by newlines
+ * \param size the number of bytes in \a buf
+ * \param line_handler the custom function
+ * \param private_data pointer to data which is passed to \a line_handler
+ *
+ * If \p line_handler is \p NULL, the function returns the number of complete
+ * lines in \p buf. Otherwise, \p line_handler is called for each complete
+ * line in \p buf. The first argument to \p line_handler is the current line,
+ * and \p private_data is passed as the second argument. The function returns
+ * if \p line_handler returns a negative value or no more lines are in the
+ * buffer. The rest of the buffer (last chunk containing an incomplete line)
+ * is moved to the beginning of the buffer.
+ *
+ * \return If \p line_handler is not \p NULL, this function returns the number
+ * of bytes not handled to \p line_handler on success, or the negative return
+ * value of the \p line_handler on errors.
+ *
+ * \sa for_each_line_ro()
+ */
+int for_each_line(char *buf, size_t size, line_handler_t *line_handler,
+ void *private_data)
+{
+ return for_each_complete_line(LINE_MODE_RW, buf, size, line_handler,
+ private_data);
+}
+
+/**
+ * call a custom function for each complete line
+ *
+ * \param buf same meaning as in \p for_each_line
+ * \param size same meaning as in \p for_each_line
+ * \param line_handler same meaning as in \p for_each_line
+ * \param private_data same meaning as in \p for_each_line
+ *
+ * This function behaves like \p for_each_line() with the following differences:
+ *
+ * - buf is left unchanged
+ *
+ * \return On success, the function returns the number of complete lines in \p
+ * buf, otherwise the (negative) return value of \p line_handler is returned.
+ *
+ * \sa for_each_line()
+ */
+int for_each_line_ro(char *buf, size_t size, line_handler_t *line_handler,
+ void *private_data)
+{
+ return for_each_complete_line(LINE_MODE_RO, buf, size, line_handler,
+ private_data);
+}
+
+/**
+ * Safely print into a buffer at a given offset
+ *
+ * \param b Determines the buffer, its size, and the offset.
+ * \param fmt The format string.
+ *
+ * This function prints into the buffer given by \a b at the offset which is
+ * also given by \a b. If there is not enough space to hold the result, the
+ * buffer size is doubled until the underlying call to vsnprintf() succeeds.
+ * Upon return, the offset of \a b is adjusted accordingly so that subsequent
+ * calls to this function append data to what is already contained in the
+ * buffer.
+ *
+ * It's OK to call this function with \p b->buf being \p NULL. In this case, an
+ * initial buffer is allocated.
+ *
+ * \return The number of bytes printed into the buffer (not including the
+ * therminating \p NULL byte).
+ *
+ * \sa make_message(), vsnprintf(3).
+ */
+__printf_2_3 int para_printf(struct para_buffer *b, const char *fmt, ...)
+{
+ int ret;
+
+ if (!b->buf) {
+ b->buf = para_malloc(128);
+ b->size = 128;
+ b->offset = 0;
+ } else if (b->size <= b->offset + 1) {
+ b->size *= 2;
+ b->buf = para_realloc(b->buf, b->size);
+ }
+ while (1) {
+ char *p = b->buf + b->offset;
+ size_t size = b->size - b->offset;
+ va_list ap;
+ va_start(ap, fmt);
+ ret = vsnprintf(p, size, fmt, ap);
+ va_end(ap);
+ if (ret > -1 && ret < size) { /* success */
+ b->offset += ret;
+ break;
+ }
+ /* try again with more space */
+ b->size *= 2;
+ b->buf = para_realloc(b->buf, b->size);
+ }
+ return ret;
+}
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