X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=string.c;h=bb63120184c79b44270a4ae1ba671e6dd74de5e1;hp=3c80d27cc6b6ad73a95392c17cdb041837ec6ba5;hb=57e0c93e87138fdf1c8793c3d1f3d2880d717548;hpb=00e4d4da1b2c00da139b09d3ed4ab9ad9fba2691

diff --git a/string.c b/string.c
index 3c80d27c..bb631201 100644
--- a/string.c
+++ b/string.c
@@ -6,14 +6,14 @@
 
 /** \file string.c Memory allocation and string handling functions. */
 
-#include "para.h"
-#include "string.h"
-
 #include <sys/time.h> /* gettimeofday */
 #include <pwd.h>
 #include <sys/utsname.h> /* uname() */
 #include <string.h>
+#include <regex.h>
 
+#include "para.h"
+#include "string.h"
 #include "error.h"
 
 /**
@@ -33,7 +33,7 @@
 __must_check __malloc void *para_realloc(void *p, size_t size)
 {
 	/*
-	 * No need to check for NULL pointers: If p is NULL, the  call
+	 * No need to check for NULL pointers: If p is NULL, the call
 	 * to realloc is equivalent to malloc(size)
 	 */
 	assert(size);
@@ -64,7 +64,7 @@ __must_check __malloc void *para_malloc(size_t size)
 	assert(size);
 	p = malloc(size);
 	if (!p) {
-		PARA_EMERG_LOG("malloc failed (size = %zu),  aborting\n",
+		PARA_EMERG_LOG("malloc failed (size = %zu), aborting\n",
 			size);
 		exit(EXIT_FAILURE);
 	}
@@ -99,7 +99,7 @@ __must_check __malloc void *para_calloc(size_t size)
  * 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,
+ * \return A pointer to the duplicated string. If \a s was the \p NULL pointer,
  * an pointer to an empty string is returned.
  *
  * \sa strdup(3)
@@ -200,15 +200,15 @@ __must_check __malloc char *para_dirname(const char *name)
  * ends with a slash.  Otherwise, a pointer within \a name is returned.  Caller
  * must not free the result.
  */
-__must_check const char *para_basename(const char *name)
+__must_check char *para_basename(const char *name)
 {
-	const char *ret;
+	char *ret;
 
 	if (!name || !*name)
 		return NULL;
 	ret = strrchr(name, '/');
 	if (!ret)
-		return name;
+		return (char *)name;
 	ret++;
 	return ret;
 }
@@ -218,44 +218,24 @@ __must_check const char *para_basename(const char *name)
  *
  * \param buf The string to be chopped.
  *
- * Replace the last character in \p buf by zero if it is euqal to
+ * Replace the last character in \p buf by zero if it is equal to
  * the newline character.
  */
 void chop(char *buf)
 {
 	int n = strlen(buf);
+
 	if (!n)
 		return;
 	if (buf[n - 1] == '\n')
 		buf[n - 1] = '\0';
 }
 
-/**
- * Get a random filename.
- *
- * This is by no means a secure way to create temporary files in a hostile
- * direcory like \p /tmp. However, it is OK to use for temp files, fifos,
- * sockets that are created in ~/.paraslash. Result must be freed by the
- * caller.
- *
- * \return A pointer to a random filename.
- */
-__must_check __malloc char *para_tmpname(void)
-{
-	struct timeval now;
-	unsigned int seed;
-
-	gettimeofday(&now, NULL);
-	seed = now.tv_usec;
-	srand(seed);
-	return make_message("%08i", rand());
-}
-
 /**
  * Get the logname of the current user.
  *
- * \return A dynammically allocated string that must be freed by the caller. On
- * errors, the string "unknown user" is returned, i.e. this function never
+ * \return A dynamically allocated string that must be freed by the caller. On
+ * errors, the string "unknown_user" is returned, i.e. this function never
  * returns \p NULL.
  *
  * \sa getpwuid(3).
@@ -269,7 +249,7 @@ __must_check __malloc char *para_logname(void)
 /**
  * Get the home directory of the current user.
  *
- * \return A dynammically allocated string that must be freed by the caller. If
+ * \return A dynamically allocated string that must be freed by the caller. If
  * the home directory could not be found, this function returns "/tmp".
  */
 __must_check __malloc char *para_homedir(void)
@@ -278,60 +258,10 @@ __must_check __malloc char *para_homedir(void)
 	return para_strdup(pw? pw->pw_dir : "/tmp");
 }
 
-/**
- * Split string and return pointers to its parts.
- *
- * \param args The string to be split.
- * \param argv_ptr Pointer to the list of substrings.
- * \param delim Delimiter.
- *
- * 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 \a args. A pointer to this array is returned via \a argv_ptr.
- *
- * \return The number of substrings found in \a args.
- */
-__must_check unsigned split_args(char *args, char *** const argv_ptr, const char *delim)
-{
-	char *p = args;
-	char **argv;
-	size_t n = 0, i, j;
-
-	p = args + strspn(args, delim);
-	for (;;) {
-		i = strcspn(p, delim);
-		if (!i)
-			break;
-		p += i;
-		n++;
-		p += strspn(p, delim);
-	}
-	*argv_ptr = para_malloc((n + 1) * sizeof(char *));
-	argv = *argv_ptr;
-	i = 0;
-	p = args + strspn(args, delim);
-	while (p) {
-		argv[i] = p;
-		j = strcspn(p, delim);
-		if (!j)
-			break;
-		p += strcspn(p, delim);
-		if (*p) {
-			*p = '\0';
-			p++;
-			p += strspn(p, delim);
-		}
-		i++;
-	}
-	argv[n] = NULL;
-	return n;
-}
-
 /**
  * Get the own hostname.
  *
- * \return A dynammically allocated string containing the hostname.
+ * \return A dynamically allocated string containing the hostname.
  *
  * \sa uname(2).
  */
@@ -408,7 +338,7 @@ static int for_each_complete_line(enum for_each_line_modes mode, char *buf,
 /**
  * Call a custom function for each complete line.
  *
- * \param buf The buffer containing data seperated by newlines.
+ * \param buf The buffer containing data separated by newlines.
  * \param size The number of bytes in \a buf.
  * \param line_handler The custom function.
  * \param private_data Pointer passed to \a line_handler.
@@ -456,8 +386,42 @@ int for_each_line_ro(char *buf, size_t size, line_handler_t *line_handler,
 		private_data);
 }
 
+#define hex(a) (hexchar[(a) & 15])
+static void write_size_header(char *buf, int n)
+{
+	static char hexchar[] = "0123456789abcdef";
+
+	buf[0] = hex(n >> 12);
+	buf[1] = hex(n >> 8);
+	buf[2] = hex(n >> 4);
+	buf[3] = hex(n);
+	buf[4] = ' ';
+}
+
+int read_size_header(const char *buf)
+{
+	int i, len = 0;
+
+	for (i = 0; i < 4; i++) {
+		unsigned char c = buf[i];
+		len <<= 4;
+		if (c >= '0' && c <= '9') {
+			len += c - '0';
+			continue;
+		}
+		if (c >= 'a' && c <= 'f') {
+			len += c - 'a' + 10;
+			continue;
+		}
+		return -E_SIZE_PREFIX;
+	}
+	if (buf[4] != ' ')
+		return -E_SIZE_PREFIX;
+	return len;
+}
+
 /**
- * Safely print into a buffer at a given offset
+ * Safely print into a buffer at a given offset.
  *
  * \param b Determines the buffer, its size, and the offset.
  * \param fmt The format string.
@@ -465,13 +429,14 @@ int for_each_line_ro(char *buf, size_t size, line_handler_t *line_handler,
  * 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
- * or the size of the buffer exceeds the maximal size specified in \a pb.
+ * or the size of the buffer exceeds the maximal size specified in \a b.
  *
  * In the latter case the unmodified \a buf and \a offset values as well as the
  * private_data pointer of \a b are passed to the \a max_size_handler of \a b.
  * If this function succeeds, i.e. returns a non-negative value, the offset of
  * \a b is reset to zero and the given data is written to the beginning of the
- * buffer.
+ * buffer. If \a max_size_handler() returns a negative value, this value is
+ * returned by \a para_printf().
  *
  * 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
@@ -481,13 +446,15 @@ int for_each_line_ro(char *buf, size_t size, line_handler_t *line_handler,
  * initial buffer is allocated.
  *
  * \return The number of bytes printed into the buffer (not including the
- * therminating \p NULL byte).
+ * terminating \p NULL byte) on success, negative on errors. If there is no
+ * size-bound on \a b, i.e. if \p b->max_size is zero, this function never
+ * fails.
  *
  * \sa make_message(), vsnprintf(3).
  */
 __printf_2_3 int para_printf(struct para_buffer *b, const char *fmt, ...)
 {
-	int ret;
+	int ret, sz_off = (b->flags & PBF_SIZE_PREFIX)? 5 : 0;
 
 	if (!b->buf) {
 		b->buf = para_malloc(128);
@@ -498,13 +465,16 @@ __printf_2_3 int para_printf(struct para_buffer *b, const char *fmt, ...)
 		char *p = b->buf + b->offset;
 		size_t size = b->size - b->offset;
 		va_list ap;
-		if (size) {
+
+		if (size > sz_off) {
 			va_start(ap, fmt);
-			ret = vsnprintf(p, size, fmt, ap);
+			ret = vsnprintf(p + sz_off, size - sz_off, fmt, ap);
 			va_end(ap);
-			if (ret > -1 && ret < size) { /* success */
-				b->offset += ret;
-				return ret;
+			if (ret > -1 && ret < size - sz_off) { /* success */
+				b->offset += ret + sz_off;
+				if (sz_off)
+					write_size_header(p, ret);
+				return ret + sz_off;
 			}
 		}
 		/* check if we may grow the buffer */
@@ -587,21 +557,197 @@ int para_atoi32(const char *str, int32_t *value)
 	return 1;
 }
 
+static inline int loglevel_equal(const char *arg, const char * const ll)
+{
+	return !strncasecmp(arg, ll, strlen(ll));
+}
+
+/**
+ * Compute the loglevel number from its name.
+ *
+ * \param txt The name of the loglevel (debug, info, ...).
+ *
+ * \return The numeric representation of the loglevel name.
+ */
 int get_loglevel_by_name(const char *txt)
 {
-	if (!strcasecmp(txt, "debug"))
+	if (loglevel_equal(txt, "debug"))
 		return LL_DEBUG;
-	if (!strcasecmp(txt, "info"))
+	if (loglevel_equal(txt, "info"))
 		return LL_INFO;
-	if (!strcasecmp(txt, "notice"))
+	if (loglevel_equal(txt, "notice"))
 		return LL_NOTICE;
-	if (!strcasecmp(txt, "warning"))
+	if (loglevel_equal(txt, "warning"))
 		return LL_WARNING;
-	if (!strcasecmp(txt, "error"))
+	if (loglevel_equal(txt, "error"))
 		return LL_ERROR;
-	if (!strcasecmp(txt, "crit"))
+	if (loglevel_equal(txt, "crit"))
 		return LL_CRIT;
-	if (!strcasecmp(txt, "emerg"))
+	if (loglevel_equal(txt, "emerg"))
 		return LL_EMERG;
 	return -1;
 }
+
+static int get_next_word(const char *buf, const char *delim,  char **word)
+{
+	enum line_state_flags {LSF_HAVE_WORD = 1, LSF_BACKSLASH = 2,
+		LSF_SINGLE_QUOTE = 4, LSF_DOUBLE_QUOTE = 8};
+	const char *in;
+	char *out;
+	int ret, state = 0;
+
+	out = para_malloc(strlen(buf) + 1);
+	*out = '\0';
+	*word = out;
+	for (in = buf; *in; in++) {
+		const char *p;
+
+		switch (*in) {
+		case '\\':
+			if (state & LSF_BACKSLASH) /* \\ */
+				goto copy_char;
+			state |= LSF_BACKSLASH;
+			state |= LSF_HAVE_WORD;
+			continue;
+		case 'n':
+		case 't':
+			if (state & LSF_BACKSLASH) { /* \n or \t */
+				*out++ = (*in == 'n')? '\n' : '\t';
+				state &= ~LSF_BACKSLASH;
+				continue;
+			}
+			goto copy_char;
+		case '"':
+			if (state & LSF_BACKSLASH) /* \" */
+				goto copy_char;
+			if (state & LSF_SINGLE_QUOTE) /* '" */
+				goto copy_char;
+			if (state & LSF_DOUBLE_QUOTE) {
+				state &= ~LSF_DOUBLE_QUOTE;
+				continue;
+			}
+			state |= LSF_HAVE_WORD;
+			state |= LSF_DOUBLE_QUOTE;
+			continue;
+		case '\'':
+			if (state & LSF_BACKSLASH) /* \' */
+				goto copy_char;
+			if (state & LSF_DOUBLE_QUOTE) /* "' */
+				goto copy_char;
+			if (state & LSF_SINGLE_QUOTE) {
+				state &= ~LSF_SINGLE_QUOTE;
+				continue;
+			}
+			state |= LSF_HAVE_WORD;
+			state |= LSF_SINGLE_QUOTE;
+			continue;
+		}
+		for (p = delim; *p; p++) {
+			if (*in != *p)
+				continue;
+			if (state & LSF_BACKSLASH)
+				goto copy_char;
+			if (state & LSF_SINGLE_QUOTE)
+				goto copy_char;
+			if (state & LSF_DOUBLE_QUOTE)
+				goto copy_char;
+			if (state & LSF_HAVE_WORD)
+				goto success;
+			break;
+		}
+		if (*p) /* ignore delimiter at the beginning */
+			continue;
+copy_char:
+		state |= LSF_HAVE_WORD;
+		*out++ = *in;
+		state &= ~LSF_BACKSLASH;
+	}
+	ret = 0;
+	if (!(state & LSF_HAVE_WORD))
+		goto out;
+	ret = -ERRNO_TO_PARA_ERROR(EINVAL);
+	if (state & LSF_BACKSLASH) {
+		PARA_ERROR_LOG("trailing backslash\n");
+		goto out;
+	}
+	if ((state & LSF_SINGLE_QUOTE) || (state & LSF_DOUBLE_QUOTE)) {
+		PARA_ERROR_LOG("unmatched quote character\n");
+		goto out;
+	}
+success:
+	*out = '\0';
+	return in - buf;
+out:
+	free(*word);
+	*word = NULL;
+	return ret;
+}
+
+/**
+ * Free an array of words created by create_argv().
+ *
+ * \param argv A pointer previously obtained by \ref create_argv().
+ */
+void free_argv(char **argv)
+{
+	int i;
+
+	for (i = 0; argv[i]; i++)
+		free(argv[i]);
+	free(argv);
+}
+
+/**
+ * Split a buffer into words.
+ *
+ * This parser honors single and double quotes, backslash-escaped characters
+ * and special characters like \p \\n. The result contains pointers to copies
+ * of the words contained in \a buf and has to be freed by using \ref
+ * free_argv().
+ *
+ * \param buf The buffer to be split.
+ * \param delim Each character in this string is treated as a separator.
+ * \param result The array of words is returned here.
+ *
+ * \return Number of words in \a buf, negative on errors.
+ */
+int create_argv(const char *buf, const char *delim, char ***result)
+{
+	char *word, **argv = para_malloc(2 * sizeof(char *));
+	const char *p;
+	int ret, num_words;
+
+	for (p = buf, num_words = 0; ; p += ret, num_words++) {
+		ret = get_next_word(p, delim, &word);
+		if (ret < 0)
+			goto err;
+		if (!ret)
+			break;
+		argv = para_realloc(argv, (num_words + 2) * sizeof(char*));
+		argv[num_words] = word;
+	}
+	argv[num_words] = NULL;
+	*result = argv;
+	return num_words;
+err:
+	while (num_words > 0)
+		free(argv[--num_words]);
+	free(argv);
+	return ret;
+}
+
+int para_regcomp(regex_t *preg, const char *regex, int cflags)
+{
+	char *buf;
+	size_t size;
+	int ret = regcomp(preg, regex, cflags);
+
+	if (ret == 0)
+		return 1;
+	size = regerror(ret, preg, NULL, 0);
+	buf = para_malloc(size);
+	regerror(ret, preg, buf, size);
+	PARA_ERROR_LOG("%s\n", buf);
+	free(buf);
+	return -E_REGEX;
+}