/*
- * Copyright (C) 2004-2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2004-2013 Andre Noll <maan@systemlinux.org>
*
* Licensed under the GPL v2. For licencing details see COPYING.
*/
/** \file string.c Memory allocation and string handling functions. */
-#include <sys/time.h> /* gettimeofday */
+#define _GNU_SOURCE
+
#include <pwd.h>
#include <sys/utsname.h> /* uname() */
+
#include <string.h>
#include <regex.h>
+#include <langinfo.h>
+#include <wchar.h>
+#include <wctype.h>
+
#include "para.h"
#include "string.h"
#include "error.h"
exit(EXIT_FAILURE);
}
+/**
+ * Print a formated message to a dynamically allocated string.
+ *
+ * \param result The formated string is returned here.
+ * \param fmt The format string.
+ * \param ap Initialized list of arguments.
+ *
+ * This function is similar to vasprintf(), a GNU extension which is not in C
+ * or POSIX. It allocates a string large enough to hold the output including
+ * the terminating null byte. The allocated string is returned via the first
+ * argument and must be freed by the caller. However, unlike vasprintf(), this
+ * function calls exit() if insufficient memory is available, while vasprintf()
+ * returns -1 in this case.
+ *
+ * \return Number of bytes written, not including the terminating \p NULL
+ * character.
+ *
+ * \sa printf(3), vsnprintf(3), va_start(3), vasprintf(3), \ref xasprintf().
+ */
+__printf_2_0 unsigned xvasprintf(char **result, const char *fmt, va_list ap)
+{
+ int ret;
+ size_t size;
+ va_list aq;
+
+ va_copy(aq, ap);
+ ret = vsnprintf(NULL, 0, fmt, aq);
+ va_end(aq);
+ assert(ret >= 0);
+ size = ret + 1;
+ *result = para_malloc(size);
+ va_copy(aq, ap);
+ ret = vsnprintf(*result, size, fmt, aq);
+ va_end(aq);
+ assert(ret >= 0 && ret < size);
+ return ret;
+}
+
+/**
+ * Print to a dynamically allocated string, variable number of arguments.
+ *
+ * \param result See \ref xvasprintf().
+ * \param fmt Usual format string.
+ *
+ * \return The return value of the underlying call to \ref xvasprintf().
+ *
+ * \sa \ref xvasprintf() and the references mentioned there.
+ */
+__printf_2_3 unsigned xasprintf(char **result, const char *fmt, ...)
+{
+ va_list ap;
+ unsigned ret;
+
+ va_start(ap, fmt);
+ ret = xvasprintf(result, fmt, ap);
+ va_end(ap);
+ return ret;
+}
+
/**
* Allocate a sufficiently large string and print into it.
*
* \return This function either returns a pointer to a string that must be
* freed by the caller or aborts without returning.
*
- * \sa printf(3).
+ * \sa printf(3), xasprintf().
*/
__must_check __printf_1_2 __malloc char *make_message(const char *fmt, ...)
{
char *msg;
+ va_list ap;
- PARA_VSPRINTF(fmt, msg);
+ va_start(ap, fmt);
+ xvasprintf(&msg, fmt, ap);
+ va_end(ap);
return msg;
}
+/**
+ * Free the content of a pointer and set it to \p NULL.
+ *
+ * This is equivalent to "free(*arg); *arg = NULL;".
+ *
+ * \param arg The pointer whose content should be freed.
+ */
+void freep(void *arg)
+{
+ void **ptr = (void **)arg;
+ free(*ptr);
+ *ptr = NULL;
+}
+
/**
* Paraslash's version of strcat().
*
private_data);
}
+/** Return the hex characters of the lower 4 bits. */
#define hex(a) (hexchar[(a) & 15])
+
static void write_size_header(char *buf, int n)
{
static char hexchar[] = "0123456789abcdef";
buf[4] = ' ';
}
+/**
+ * Read a four-byte hex-number and return its value.
+ *
+ * Each status item sent by para_server is prefixed with such a hex number in
+ * ASCII which describes the size of the status item.
+ *
+ * \param buf The buffer which must be at least four bytes long.
+ *
+ * \return The value of the hex number on success, \p -E_SIZE_PREFIX if the
+ * buffer did not contain only hex digits.
+ */
int read_size_header(const char *buf)
{
int i, len = 0;
}
}
-/** \cond LLONG_MAX and LLONG_LIN might not be defined. */
+/** \cond llong_minmax */
+/* LLONG_MAX and LLONG_MIN might not be defined. */
#ifndef LLONG_MAX
-#define LLONG_MAX (1 << (sizeof(long) - 1))
+#define LLONG_MAX 9223372036854775807LL
#endif
#ifndef LLONG_MIN
#define LLONG_MIN (-LLONG_MAX - 1LL)
#endif
-/** \endcond */
+/** \endcond llong_minmax */
/**
* Convert a string to a 64-bit signed integer value.
return -1;
}
-static int get_next_word(const char *buf, const char *delim, char **word)
+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};
}
/**
- * Free an array of words created by create_argv().
+ * Get the number of the word the cursor is on.
+ *
+ * \param buf The zero-terminated line buffer.
+ * \param delim Characters that separate words.
+ * \param point The cursor position.
+ *
+ * \return Zero-based word number.
+ */
+int compute_word_num(const char *buf, const char *delim, int point)
+{
+ int ret, num_words;
+ const char *p;
+ char *word;
+
+ for (p = buf, num_words = 0; ; p += ret, num_words++) {
+ ret = get_next_word(p, delim, &word);
+ if (ret <= 0)
+ break;
+ free(word);
+ if (p + ret >= buf + point)
+ break;
+ }
+ return num_words;
+}
+
+/**
+ * Free an array of words created by create_argv() or create_shifted_argv().
*
* \param argv A pointer previously obtained by \ref create_argv().
*/
{
int i;
+ if (!argv)
+ return;
for (i = 0; argv[i]; i++)
free(argv[i]);
free(argv);
}
+static int create_argv_offset(int offset, const char *buf, const char *delim,
+ char ***result)
+{
+ char *word, **argv = para_malloc((offset + 1) * sizeof(char *));
+ const char *p;
+ int i, ret;
+
+ for (i = 0; i < offset; i++)
+ argv[i] = NULL;
+ for (p = buf; p && *p; p += ret, i++) {
+ ret = get_next_word(p, delim, &word);
+ if (ret < 0)
+ goto err;
+ if (!ret)
+ break;
+ argv = para_realloc(argv, (i + 2) * sizeof(char*));
+ argv[i] = word;
+ }
+ argv[i] = NULL;
+ *result = argv;
+ return i;
+err:
+ while (i > 0)
+ free(argv[--i]);
+ free(argv);
+ *result = NULL;
+ return ret;
+}
+
/**
* Split a buffer into words.
*
*/
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;
+ return create_argv_offset(0, buf, delim, result);
+}
- 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;
+/**
+ * Split a buffer into words, offset one.
+ *
+ * This is similar to \ref create_argv() but the returned array is one element
+ * larger, words start at index one and element zero is initialized to \p NULL.
+ * Callers must set element zero to a non-NULL value before calling free_argv()
+ * on the returned array to avoid a memory leak.
+ *
+ * \param buf See \ref create_argv().
+ * \param delim See \ref create_argv().
+ * \param result See \ref create_argv().
+ *
+ * \return Number of words plus one on success, negative on errors.
+ */
+int create_shifted_argv(const char *buf, const char *delim, char ***result)
+{
+ return create_argv_offset(1, buf, delim, result);
}
+/**
+ * Find out if the given string is contained in the arg vector.
+ *
+ * \param arg The string to look for.
+ * \param argv The array to search.
+ *
+ * \return The first index whose value equals \a arg, or \p -E_ARG_NOT_FOUND if
+ * arg was not found in \a argv.
+ */
+int find_arg(const char *arg, char **argv)
+{
+ int i;
+
+ if (!argv)
+ return -E_ARG_NOT_FOUND;
+ for (i = 0; argv[i]; i++)
+ if (strcmp(arg, argv[i]) == 0)
+ return i;
+ return -E_ARG_NOT_FOUND;
+}
+
+/**
+ * Compile a regular expression.
+ *
+ * This simple wrapper calls regcomp() and logs a message on errors.
+ *
+ * \param preg See regcomp(3).
+ * \param regex See regcomp(3).
+ * \param cflags See regcomp(3).
+ *
+ * \return Standard.
+ */
int para_regcomp(regex_t *preg, const char *regex, int cflags)
{
char *buf;
free(buf);
return -E_REGEX;
}
+
+/**
+ * strdup() for not necessarily zero-terminated strings.
+ *
+ * \param src The source buffer.
+ * \param len The number of bytes to be copied.
+ *
+ * \return A 0-terminated buffer of length \a len + 1.
+ *
+ * This is similar to strndup(), which is a GNU extension. However, one
+ * difference is that strndup() returns \p NULL if insufficient memory was
+ * available while this function aborts in this case.
+ *
+ * \sa strdup(), \ref para_strdup().
+ */
+char *safe_strdup(const char *src, size_t len)
+{
+ char *p;
+
+ assert(len < (size_t)-1);
+ p = para_malloc(len + 1);
+ if (len > 0)
+ memcpy(p, src, len);
+ p[len] = '\0';
+ return p;
+}
+
+/**
+ * Copy the value of a key=value pair.
+ *
+ * This checks whether the given buffer starts with "key=", ignoring case. If
+ * yes, a copy of the value is returned. The source buffer may not be
+ * zero-terminated.
+ *
+ * \param src The source buffer.
+ * \param len The number of bytes of the tag.
+ * \param key Only copy if it is the value of this key.
+ *
+ * \return A zero-terminated buffer, or \p NULL if the key was
+ * not of the given type.
+ */
+char *key_value_copy(const char *src, size_t len, const char *key)
+{
+ int keylen = strlen(key);
+
+ if (len <= keylen)
+ return NULL;
+ if (strncasecmp(src, key, keylen))
+ return NULL;
+ if (src[keylen] != '=')
+ return NULL;
+ return safe_strdup(src + keylen + 1, len - keylen - 1);
+}
+
+static bool utf8_mode(void)
+{
+ static bool initialized, have_utf8;
+
+ if (!initialized) {
+ char *info = nl_langinfo(CODESET);
+ have_utf8 = (info && strcmp(info, "UTF-8") == 0);
+ initialized = true;
+ PARA_INFO_LOG("%susing UTF-8 character encoding\n",
+ have_utf8? "" : "not ");
+ }
+ return have_utf8;
+}
+
+/*
+ * glibc's wcswidth returns -1 if the string contains a tab character, which
+ * makes the function next to useless. The two functions below are taken from
+ * mutt.
+ */
+
+#define IsWPrint(wc) (iswprint(wc) || wc >= 0xa0)
+
+static int mutt_wcwidth(wchar_t wc, size_t pos)
+{
+ int n;
+
+ if (wc == 0x09) /* tab */
+ return (pos | 7) + 1 - pos;
+ n = wcwidth(wc);
+ if (IsWPrint(wc) && n > 0)
+ return n;
+ if (!(wc & ~0x7f))
+ return 2;
+ if (!(wc & ~0xffff))
+ return 6;
+ return 10;
+}
+
+static size_t mutt_wcswidth(const wchar_t *s, size_t n)
+{
+ size_t w = 0;
+
+ while (n--)
+ w += mutt_wcwidth(*s++, w);
+ return w;
+}
+
+/**
+ * Skip a given number of cells at the beginning of a string.
+ *
+ * \param s The input string.
+ * \param cells_to_skip Desired number of cells that should be skipped.
+ * \param bytes_to_skip Result.
+ *
+ * This function computes how many input bytes must be skipped to advance a
+ * string by the given width. If the current character encoding is not UTF-8,
+ * this is simply the given number of cells, i.e. \a cells_to_skip. Otherwise,
+ * \a s is treated as a multibyte string and on successful return, \a s +
+ * bytes_to_skip points to the start of a multibyte string such that the total
+ * width of the multibyte characters that are skipped by advancing \a s that
+ * many bytes equals at least \a cells_to_skip.
+ *
+ * \return Standard.
+ */
+int skip_cells(const char *s, size_t cells_to_skip, size_t *bytes_to_skip)
+{
+ wchar_t wc;
+ mbstate_t ps;
+ size_t n, bytes_parsed, cells_skipped;
+
+ *bytes_to_skip = 0;
+ if (cells_to_skip == 0)
+ return 0;
+ if (!utf8_mode()) {
+ *bytes_to_skip = cells_to_skip;
+ return 0;
+ }
+ bytes_parsed = cells_skipped = 0;
+ memset(&ps, 0, sizeof(ps));
+ n = strlen(s);
+ while (cells_to_skip > cells_skipped) {
+ size_t mbret;
+
+ mbret = mbrtowc(&wc, s + bytes_parsed, n - bytes_parsed, &ps);
+ assert(mbret != 0);
+ if (mbret == (size_t)-1 || mbret == (size_t)-2)
+ return -ERRNO_TO_PARA_ERROR(EILSEQ);
+ bytes_parsed += mbret;
+ cells_skipped += mutt_wcwidth(wc, cells_skipped);
+ }
+ *bytes_to_skip = bytes_parsed;
+ return 1;
+}
+
+/**
+ * Compute the width of an UTF-8 string.
+ *
+ * \param s The string.
+ * \param result The width of \a s is returned here.
+ *
+ * If not in UTF8-mode. this function is just a wrapper for strlen(3).
+ * Otherwise \a s is treated as an UTF-8 string and its display width is
+ * computed. Note that this function may fail if the underlying call to
+ * mbsrtowcs(3) fails, so the caller must check the return value.
+ *
+ * \sa nl_langinfo(3), wcswidth(3).
+ *
+ * \return Standard.
+ */
+__must_check int strwidth(const char *s, size_t *result)
+{
+ const char *src = s;
+ mbstate_t state;
+ static wchar_t *dest;
+ size_t num_wchars;
+
+ /*
+ * Never call any log function here. This may result in an endless loop
+ * as para_gui's para_log() calls this function.
+ */
+
+ if (!utf8_mode()) {
+ *result = strlen(s);
+ return 0;
+ }
+ memset(&state, 0, sizeof(state));
+ *result = 0;
+ num_wchars = mbsrtowcs(NULL, &src, 0, &state);
+ if (num_wchars == (size_t)-1)
+ return -ERRNO_TO_PARA_ERROR(errno);
+ if (num_wchars == 0)
+ return 0;
+ dest = para_malloc(num_wchars * sizeof(*dest));
+ src = s;
+ memset(&state, 0, sizeof(state));
+ num_wchars = mbsrtowcs(dest, &src, num_wchars, &state);
+ assert(num_wchars > 0 && num_wchars != (size_t)-1);
+ *result = mutt_wcswidth(dest, num_wchars);
+ free(dest);
+ return 1;
+}
projects / paraslash.git / blobdiff