/* stringhelp.c - standard string helper functions * Copyright (C) 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, * 2008, 2009, 2010 Free Software Foundation, Inc. * Copyright (C) 2014 Werner Koch * * This file is part of JNLIB, which is a subsystem of GnuPG. * * JNLIB is free software; you can redistribute it and/or modify it * under the terms of either * * - the GNU Lesser General Public License as published by the Free * Software Foundation; either version 3 of the License, or (at * your option) any later version. * * or * * - 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. * * or both in parallel, as here. * * JNLIB 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 copies of the GNU General Public License * and the GNU Lesser General Public License along with this program; * if not, see . */ #include #include #include #include #include #include #ifdef HAVE_PWD_H # include #endif #include #include #ifdef HAVE_W32_SYSTEM # ifdef HAVE_WINSOCK2_H # include # endif # include #endif #include "libjnlib-config.h" #include "utf8conv.h" #include "sysutils.h" #include "stringhelp.h" #define tohex_lower(n) ((n) < 10 ? ((n) + '0') : (((n) - 10) + 'a')) /* Sometimes we want to avoid mixing slashes and backslashes on W32 and prefer backslashes. There is usual no problem with mixing them, however a very few W32 API calls can't grok plain slashes. Printing filenames with mixed slashes also looks a bit strange. This function has no effext on POSIX. */ static inline char * change_slashes (char *name) { #ifdef HAVE_DOSISH_SYSTEM char *p; if (strchr (name, '\\')) { for (p=name; *p; p++) if (*p == '/') *p = '\\'; } #endif /*HAVE_DOSISH_SYSTEM*/ return name; } /* * Check whether STRING starts with KEYWORD. The keyword is * delimited by end of string, a space or a tab. Returns NULL if not * found or a pointer into STRING to the next non-space character * after the KEYWORD (which may be end of string). */ char * has_leading_keyword (const char *string, const char *keyword) { size_t n = strlen (keyword); if (!strncmp (string, keyword, n) && (!string[n] || string[n] == ' ' || string[n] == '\t')) { string += n; while (*string == ' ' || *string == '\t') string++; return (char*)string; } return NULL; } /* * Look for the substring SUB in buffer and return a pointer to that * substring in BUFFER or NULL if not found. * Comparison is case-insensitive. */ const char * memistr (const void *buffer, size_t buflen, const char *sub) { const unsigned char *buf = buffer; const unsigned char *t = (const unsigned char *)buffer; const unsigned char *s = (const unsigned char *)sub; size_t n = buflen; for ( ; n ; t++, n-- ) { if ( toupper (*t) == toupper (*s) ) { for ( buf=t++, buflen = n--, s++; n && toupper (*t) == toupper (*s); t++, s++, n-- ) ; if (!*s) return (const char*)buf; t = buf; s = (const unsigned char *)sub ; n = buflen; } } return NULL; } const char * ascii_memistr ( const void *buffer, size_t buflen, const char *sub ) { const unsigned char *buf = buffer; const unsigned char *t = (const unsigned char *)buf; const unsigned char *s = (const unsigned char *)sub; size_t n = buflen; for ( ; n ; t++, n-- ) { if (ascii_toupper (*t) == ascii_toupper (*s) ) { for ( buf=t++, buflen = n--, s++; n && ascii_toupper (*t) == ascii_toupper (*s); t++, s++, n-- ) ; if (!*s) return (const char*)buf; t = (const unsigned char *)buf; s = (const unsigned char *)sub ; n = buflen; } } return NULL; } /* This function is similar to strncpy(). However it won't copy more than N - 1 characters and makes sure that a '\0' is appended. With N given as 0, nothing will happen. With DEST given as NULL, memory will be allocated using jnlib_xmalloc (i.e. if it runs out of core the function terminates). Returns DES or a pointer to the allocated memory. */ char * mem2str( char *dest , const void *src , size_t n ) { char *d; const char *s; if( n ) { if( !dest ) dest = jnlib_xmalloc( n ) ; d = dest; s = src ; for(n--; n && *s; n-- ) *d++ = *s++; *d = '\0' ; } return dest ; } /**************** * remove leading and trailing white spaces */ char * trim_spaces( char *str ) { char *string, *p, *mark; string = str; /* find first non space character */ for( p=string; *p && isspace( *(byte*)p ) ; p++ ) ; /* move characters */ for( (mark = NULL); (*string = *p); string++, p++ ) if( isspace( *(byte*)p ) ) { if( !mark ) mark = string ; } else mark = NULL ; if( mark ) *mark = '\0' ; /* remove trailing spaces */ return str ; } /**************** * remove trailing white spaces */ char * trim_trailing_spaces( char *string ) { char *p, *mark; for( mark = NULL, p = string; *p; p++ ) { if( isspace( *(byte*)p ) ) { if( !mark ) mark = p; } else mark = NULL; } if( mark ) *mark = '\0' ; return string ; } unsigned trim_trailing_chars( byte *line, unsigned len, const char *trimchars ) { byte *p, *mark; unsigned n; for(mark=NULL, p=line, n=0; n < len; n++, p++ ) { if( strchr(trimchars, *p ) ) { if( !mark ) mark = p; } else mark = NULL; } if( mark ) { *mark = 0; return mark - line; } return len; } /**************** * remove trailing white spaces and return the length of the buffer */ unsigned trim_trailing_ws( byte *line, unsigned len ) { return trim_trailing_chars( line, len, " \t\r\n" ); } size_t length_sans_trailing_chars (const unsigned char *line, size_t len, const char *trimchars ) { const unsigned char *p, *mark; size_t n; for( mark=NULL, p=line, n=0; n < len; n++, p++ ) { if (strchr (trimchars, *p )) { if( !mark ) mark = p; } else mark = NULL; } if (mark) return mark - line; return len; } /* * Return the length of line ignoring trailing white-space. */ size_t length_sans_trailing_ws (const unsigned char *line, size_t len) { return length_sans_trailing_chars (line, len, " \t\r\n"); } /* * Extract from a given path the filename component. This function * terminates the process on memory shortage. */ char * make_basename(const char *filepath, const char *inputpath) { #ifdef __riscos__ return riscos_make_basename(filepath, inputpath); #else char *p; (void)inputpath; /* Only required for riscos. */ if ( !(p=strrchr(filepath, '/')) ) #ifdef HAVE_DOSISH_SYSTEM if ( !(p=strrchr(filepath, '\\')) ) #endif #ifdef HAVE_DRIVE_LETTERS if ( !(p=strrchr(filepath, ':')) ) #endif { return jnlib_xstrdup(filepath); } return jnlib_xstrdup(p+1); #endif } /* * Extract from a given filename the path prepended to it. If there * isn't a path prepended to the filename, a dot is returned ('.'). * This function terminates the process on memory shortage. */ char * make_dirname(const char *filepath) { char *dirname; int dirname_length; char *p; if ( !(p=strrchr(filepath, '/')) ) #ifdef HAVE_DOSISH_SYSTEM if ( !(p=strrchr(filepath, '\\')) ) #endif #ifdef HAVE_DRIVE_LETTERS if ( !(p=strrchr(filepath, ':')) ) #endif { return jnlib_xstrdup("."); } dirname_length = p-filepath; dirname = jnlib_xmalloc(dirname_length+1); strncpy(dirname, filepath, dirname_length); dirname[dirname_length] = 0; return dirname; } static char * get_pwdir (int xmode, const char *name) { char *result = NULL; #ifdef HAVE_PWD_H struct passwd *pwd = NULL; if (name) { #ifdef HAVE_GETPWNAM /* Fixme: We should use getpwnam_r if available. */ pwd = getpwnam (name); #endif } else { #ifdef HAVE_GETPWUID /* Fixme: We should use getpwuid_r if available. */ pwd = getpwuid (getuid()); #endif } if (pwd) { if (xmode) result = jnlib_xstrdup (pwd->pw_dir); else result = jnlib_strdup (pwd->pw_dir); } #else /*!HAVE_PWD_H*/ /* No support at all. */ (void)xmode; (void)name; #endif /*HAVE_PWD_H*/ return result; } /* xmode 0 := Return NULL on error 1 := Terminate on error 2 := Make sure that name is absolute; return NULL on error 3 := Make sure that name is absolute; terminate on error */ static char * do_make_filename (int xmode, const char *first_part, va_list arg_ptr) { const char *argv[32]; int argc; size_t n; int skip = 1; char *home_buffer = NULL; char *name, *home, *p; int want_abs; want_abs = !!(xmode & 2); xmode &= 1; n = strlen (first_part) + 1; argc = 0; while ( (argv[argc] = va_arg (arg_ptr, const char *)) ) { n += strlen (argv[argc]) + 1; if (argc >= DIM (argv)-1) { if (xmode) BUG (); jnlib_set_errno (EINVAL); return NULL; } argc++; } n++; home = NULL; if (*first_part == '~') { if (first_part[1] == '/' || !first_part[1]) { /* This is the "~/" or "~" case. */ home = getenv("HOME"); if (!home) home = home_buffer = get_pwdir (xmode, NULL); if (home && *home) n += strlen (home); } else { /* This is the "~username/" or "~username" case. */ char *user; if (xmode) user = jnlib_xstrdup (first_part+1); else { user = jnlib_strdup (first_part+1); if (!user) return NULL; } p = strchr (user, '/'); if (p) *p = 0; skip = 1 + strlen (user); home = home_buffer = get_pwdir (xmode, user); jnlib_free (user); if (home) n += strlen (home); else skip = 1; } } if (xmode) name = jnlib_xmalloc (n); else { name = jnlib_malloc (n); if (!name) { jnlib_free (home_buffer); return NULL; } } if (home) p = stpcpy (stpcpy (name, home), first_part + skip); else p = stpcpy (name, first_part); jnlib_free (home_buffer); for (argc=0; argv[argc]; argc++) p = stpcpy (stpcpy (p, "/"), argv[argc]); if (want_abs) { #ifdef HAVE_DRIVE_LETTERS p = strchr (name, ':'); if (p) p++; else p = name; #else p = name; #endif if (*p != '/' #ifdef HAVE_DRIVE_LETTERS && *p != '\\' #endif ) { home = gnupg_getcwd (); if (!home) { if (xmode) { fprintf (stderr, "\nfatal: getcwd failed: %s\n", strerror (errno)); exit(2); } jnlib_free (name); return NULL; } n = strlen (home) + 1 + strlen (name) + 1; if (xmode) home_buffer = jnlib_xmalloc (n); else { home_buffer = jnlib_malloc (n); if (!home_buffer) { jnlib_free (name); return NULL; } } if (p == name) p = home_buffer; else /* Windows case. */ { memcpy (home_buffer, p, p - name + 1); p = home_buffer + (p - name + 1); } strcpy (stpcpy (stpcpy (p, home), "/"), name); jnlib_free (name); name = home_buffer; /* Let's do a simple compression to catch the most common case of using "." for gpg's --homedir option. */ n = strlen (name); if (n > 2 && name[n-2] == '/' && name[n-1] == '.') name[n-2] = 0; } } return change_slashes (name); } /* Construct a filename from the NULL terminated list of parts. Tilde expansion is done for the first argument. This function terminates the process on memory shortage. */ char * make_filename (const char *first_part, ... ) { va_list arg_ptr; char *result; va_start (arg_ptr, first_part); result = do_make_filename (1, first_part, arg_ptr); va_end (arg_ptr); return result; } /* Construct a filename from the NULL terminated list of parts. Tilde expansion is done for the first argument. This function may return NULL on error. */ char * make_filename_try (const char *first_part, ... ) { va_list arg_ptr; char *result; va_start (arg_ptr, first_part); result = do_make_filename (0, first_part, arg_ptr); va_end (arg_ptr); return result; } /* Construct an absolute filename from the NULL terminated list of parts. Tilde expansion is done for the first argument. This function terminates the process on memory shortage. */ char * make_absfilename (const char *first_part, ... ) { va_list arg_ptr; char *result; va_start (arg_ptr, first_part); result = do_make_filename (3, first_part, arg_ptr); va_end (arg_ptr); return result; } /* Construct an absolute filename from the NULL terminated list of parts. Tilde expansion is done for the first argument. This function may return NULL on error. */ char * make_absfilename_try (const char *first_part, ... ) { va_list arg_ptr; char *result; va_start (arg_ptr, first_part); result = do_make_filename (2, first_part, arg_ptr); va_end (arg_ptr); return result; } /* Compare whether the filenames are identical. This is a special version of strcmp() taking the semantics of filenames in account. Note that this function works only on the supplied names without considering any context like the current directory. See also same_file_p(). */ int compare_filenames (const char *a, const char *b) { #ifdef HAVE_DOSISH_SYSTEM for ( ; *a && *b; a++, b++ ) { if (*a != *b && (toupper (*(const unsigned char*)a) != toupper (*(const unsigned char*)b) ) && !((*a == '/' && *b == '\\') || (*a == '\\' && *b == '/'))) break; } if ((*a == '/' && *b == '\\') || (*a == '\\' && *b == '/')) return 0; else return (toupper (*(const unsigned char*)a) - toupper (*(const unsigned char*)b)); #else return strcmp(a,b); #endif } /* Convert 2 hex characters at S to a byte value. Return this value or -1 if there is an error. */ int hextobyte (const char *s) { int c; if ( *s >= '0' && *s <= '9' ) c = 16 * (*s - '0'); else if ( *s >= 'A' && *s <= 'F' ) c = 16 * (10 + *s - 'A'); else if ( *s >= 'a' && *s <= 'f' ) c = 16 * (10 + *s - 'a'); else return -1; s++; if ( *s >= '0' && *s <= '9' ) c += *s - '0'; else if ( *s >= 'A' && *s <= 'F' ) c += 10 + *s - 'A'; else if ( *s >= 'a' && *s <= 'f' ) c += 10 + *s - 'a'; else return -1; return c; } /* Print a BUFFER to stream FP while replacing all control characters and the characters DELIM and DELIM2 with standard C escape sequences. Returns the number of characters printed. */ size_t print_sanitized_buffer2 (FILE *fp, const void *buffer, size_t length, int delim, int delim2) { const unsigned char *p = buffer; size_t count = 0; for (; length; length--, p++, count++) { if (*p < 0x20 || *p == 0x7f || *p == delim || *p == delim2 || ((delim || delim2) && *p=='\\')) { putc ('\\', fp); count++; if (*p == '\n') { putc ('n', fp); count++; } else if (*p == '\r') { putc ('r', fp); count++; } else if (*p == '\f') { putc ('f', fp); count++; } else if (*p == '\v') { putc ('v', fp); count++; } else if (*p == '\b') { putc ('b', fp); count++; } else if (!*p) { putc('0', fp); count++; } else { fprintf (fp, "x%02x", *p); count += 3; } } else { putc (*p, fp); count++; } } return count; } /* Same as print_sanitized_buffer2 but with just one delimiter. */ size_t print_sanitized_buffer (FILE *fp, const void *buffer, size_t length, int delim) { return print_sanitized_buffer2 (fp, buffer, length, delim, 0); } size_t print_sanitized_utf8_buffer (FILE *fp, const void *buffer, size_t length, int delim) { const char *p = buffer; size_t i; /* We can handle plain ascii simpler, so check for it first. */ for (i=0; i < length; i++ ) { if ( (p[i] & 0x80) ) break; } if (i < length) { char *buf = utf8_to_native (p, length, delim); /*(utf8 conversion already does the control character quoting)*/ i = strlen (buf); fputs (buf, fp); jnlib_free (buf); return i; } else return print_sanitized_buffer (fp, p, length, delim); } size_t print_sanitized_string2 (FILE *fp, const char *string, int delim, int delim2) { return string? print_sanitized_buffer2 (fp, string, strlen (string), delim, delim2):0; } size_t print_sanitized_string (FILE *fp, const char *string, int delim) { return string? print_sanitized_buffer (fp, string, strlen (string), delim):0; } size_t print_sanitized_utf8_string (FILE *fp, const char *string, int delim) { return string? print_sanitized_utf8_buffer (fp, string, strlen (string), delim) : 0; } /* Create a string from the buffer P_ARG of length N which is suitable for printing. Caller must release the created string using xfree. This function terminates the process on memory shortage. */ char * sanitize_buffer (const void *p_arg, size_t n, int delim) { const unsigned char *p = p_arg; size_t save_n, buflen; const unsigned char *save_p; char *buffer, *d; /* First count length. */ for (save_n = n, save_p = p, buflen=1 ; n; n--, p++ ) { if ( *p < 0x20 || *p == 0x7f || *p == delim || (delim && *p=='\\')) { if ( *p=='\n' || *p=='\r' || *p=='\f' || *p=='\v' || *p=='\b' || !*p ) buflen += 2; else buflen += 5; } else buflen++; } p = save_p; n = save_n; /* And now make the string */ d = buffer = jnlib_xmalloc( buflen ); for ( ; n; n--, p++ ) { if (*p < 0x20 || *p == 0x7f || *p == delim || (delim && *p=='\\')) { *d++ = '\\'; if( *p == '\n' ) *d++ = 'n'; else if( *p == '\r' ) *d++ = 'r'; else if( *p == '\f' ) *d++ = 'f'; else if( *p == '\v' ) *d++ = 'v'; else if( *p == '\b' ) *d++ = 'b'; else if( !*p ) *d++ = '0'; else { sprintf(d, "x%02x", *p ); d += 3; } } else *d++ = *p; } *d = 0; return buffer; } /* Given a string containing an UTF-8 encoded text, return the number of characters in this string. It differs from strlen in that it only counts complete UTF-8 characters. Note, that this function does not take combined characters into account. */ size_t utf8_charcount (const char *s) { size_t n; for (n=0; *s; s++) if ( (*s&0xc0) != 0x80 ) /* Exclude continuation bytes: 10xxxxxx */ n++; return n; } /**************************************************** ********** W32 specific functions **************** ****************************************************/ #ifdef HAVE_W32_SYSTEM const char * w32_strerror (int ec) { static char strerr[256]; if (ec == -1) ec = (int)GetLastError (); #ifdef HAVE_W32CE_SYSTEM /* There is only a wchar_t FormatMessage. It does not make much sense to play the conversion game; we print only the code. */ snprintf (strerr, sizeof strerr, "ec=%d", (int)GetLastError ()); #else FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM, NULL, ec, MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT), strerr, DIM (strerr)-1, NULL); #endif return strerr; } #endif /*HAVE_W32_SYSTEM*/ /**************************************************** ******** Locale insensitive ctype functions ******** ****************************************************/ /* FIXME: replace them by a table lookup and macros */ int ascii_isupper (int c) { return c >= 'A' && c <= 'Z'; } int ascii_islower (int c) { return c >= 'a' && c <= 'z'; } int ascii_toupper (int c) { if (c >= 'a' && c <= 'z') c &= ~0x20; return c; } int ascii_tolower (int c) { if (c >= 'A' && c <= 'Z') c |= 0x20; return c; } int ascii_strcasecmp( const char *a, const char *b ) { if (a == b) return 0; for (; *a && *b; a++, b++) { if (*a != *b && ascii_toupper(*a) != ascii_toupper(*b)) break; } return *a == *b? 0 : (ascii_toupper (*a) - ascii_toupper (*b)); } int ascii_strncasecmp (const char *a, const char *b, size_t n) { const unsigned char *p1 = (const unsigned char *)a; const unsigned char *p2 = (const unsigned char *)b; unsigned char c1, c2; if (p1 == p2 || !n ) return 0; do { c1 = ascii_tolower (*p1); c2 = ascii_tolower (*p2); if ( !--n || c1 == '\0') break; ++p1; ++p2; } while (c1 == c2); return c1 - c2; } int ascii_memcasecmp (const void *a_arg, const void *b_arg, size_t n ) { const char *a = a_arg; const char *b = b_arg; if (a == b) return 0; for ( ; n; n--, a++, b++ ) { if( *a != *b && ascii_toupper (*a) != ascii_toupper (*b) ) return *a == *b? 0 : (ascii_toupper (*a) - ascii_toupper (*b)); } return 0; } int ascii_strcmp( const char *a, const char *b ) { if (a == b) return 0; for (; *a && *b; a++, b++) { if (*a != *b ) break; } return *a == *b? 0 : (*(signed char *)a - *(signed char *)b); } void * ascii_memcasemem (const void *haystack, size_t nhaystack, const void *needle, size_t nneedle) { if (!nneedle) return (void*)haystack; /* finding an empty needle is really easy */ if (nneedle <= nhaystack) { const char *a = haystack; const char *b = a + nhaystack - nneedle; for (; a <= b; a++) { if ( !ascii_memcasecmp (a, needle, nneedle) ) return (void *)a; } } return NULL; } /********************************************* ********** missing string functions ********* *********************************************/ #ifndef HAVE_STPCPY char * stpcpy(char *a,const char *b) { while( *b ) *a++ = *b++; *a = 0; return (char*)a; } #endif #ifndef HAVE_STRPBRK /* Find the first occurrence in S of any character in ACCEPT. Code taken from glibc-2.6/string/strpbrk.c (LGPLv2.1+) and modified. */ char * strpbrk (const char *s, const char *accept) { while (*s != '\0') { const char *a = accept; while (*a != '\0') if (*a++ == *s) return (char *) s; ++s; } return NULL; } #endif /*!HAVE_STRPBRK*/ #ifndef HAVE_STRSEP /* Code taken from glibc-2.2.1/sysdeps/generic/strsep.c. */ char * strsep (char **stringp, const char *delim) { char *begin, *end; begin = *stringp; if (begin == NULL) return NULL; /* A frequent case is when the delimiter string contains only one character. Here we don't need to call the expensive 'strpbrk' function and instead work using 'strchr'. */ if (delim[0] == '\0' || delim[1] == '\0') { char ch = delim[0]; if (ch == '\0') end = NULL; else { if (*begin == ch) end = begin; else if (*begin == '\0') end = NULL; else end = strchr (begin + 1, ch); } } else /* Find the end of the token. */ end = strpbrk (begin, delim); if (end) { /* Terminate the token and set *STRINGP past NUL character. */ *end++ = '\0'; *stringp = end; } else /* No more delimiters; this is the last token. */ *stringp = NULL; return begin; } #endif /*HAVE_STRSEP*/ #ifndef HAVE_STRLWR char * strlwr(char *s) { char *p; for(p=s; *p; p++ ) *p = tolower(*p); return s; } #endif #ifndef HAVE_STRCASECMP int strcasecmp( const char *a, const char *b ) { for( ; *a && *b; a++, b++ ) { if( *a != *b && toupper(*a) != toupper(*b) ) break; } return *(const byte*)a - *(const byte*)b; } #endif /**************** * mingw32/cpd has a memicmp() */ #ifndef HAVE_MEMICMP int memicmp( const char *a, const char *b, size_t n ) { for( ; n; n--, a++, b++ ) if( *a != *b && toupper(*(const byte*)a) != toupper(*(const byte*)b) ) return *(const byte *)a - *(const byte*)b; return 0; } #endif #ifndef HAVE_MEMRCHR void * memrchr (const void *buffer, int c, size_t n) { const unsigned char *p = buffer; for (p += n; n ; n--) if (*--p == c) return (void *)p; return NULL; } #endif /*HAVE_MEMRCHR*/ /* Percent-escape the string STR by replacing colons with '%3a'. If EXTRA is not NULL all characters in EXTRA are also escaped. */ static char * do_percent_escape (const char *str, const char *extra, int die) { int i, j; char *ptr; if (!str) return NULL; for (i=j=0; str[i]; i++) if (str[i] == ':' || str[i] == '%' || (extra && strchr (extra, str[i]))) j++; if (die) ptr = jnlib_xmalloc (i + 2 * j + 1); else { ptr = jnlib_malloc (i + 2 * j + 1); if (!ptr) return NULL; } i = 0; while (*str) { if (*str == ':') { ptr[i++] = '%'; ptr[i++] = '3'; ptr[i++] = 'a'; } else if (*str == '%') { ptr[i++] = '%'; ptr[i++] = '2'; ptr[i++] = '5'; } else if (extra && strchr (extra, *str)) { ptr[i++] = '%'; ptr[i++] = tohex_lower ((*str>>4)&15); ptr[i++] = tohex_lower (*str&15); } else ptr[i++] = *str; str++; } ptr[i] = '\0'; return ptr; } /* Percent-escape the string STR by replacing colons with '%3a'. If EXTRA is not NULL all characters in EXTRA are also escaped. This function terminates the process on memory shortage. */ char * percent_escape (const char *str, const char *extra) { return do_percent_escape (str, extra, 1); } /* Same as percent_escape but return NULL instead of exiting on memory error. */ char * try_percent_escape (const char *str, const char *extra) { return do_percent_escape (str, extra, 0); } static char * do_strconcat (const char *s1, va_list arg_ptr) { const char *argv[48]; size_t argc; size_t needed; char *buffer, *p; argc = 0; argv[argc++] = s1; needed = strlen (s1); while (((argv[argc] = va_arg (arg_ptr, const char *)))) { needed += strlen (argv[argc]); if (argc >= DIM (argv)-1) { jnlib_set_errno (EINVAL); return NULL; } argc++; } needed++; buffer = jnlib_malloc (needed); if (buffer) { for (p = buffer, argc=0; argv[argc]; argc++) p = stpcpy (p, argv[argc]); } return buffer; } /* Concatenate the string S1 with all the following strings up to a NULL. Returns a malloced buffer with the new string or NULL on a malloc error or if too many arguments are given. */ char * strconcat (const char *s1, ...) { va_list arg_ptr; char *result; if (!s1) result = jnlib_strdup (""); else { va_start (arg_ptr, s1); result = do_strconcat (s1, arg_ptr); va_end (arg_ptr); } return result; } /* Same as strconcat but terminate the process with an error message if something goes wrong. */ char * xstrconcat (const char *s1, ...) { va_list arg_ptr; char *result; if (!s1) result = jnlib_xstrdup (""); else { va_start (arg_ptr, s1); result = do_strconcat (s1, arg_ptr); va_end (arg_ptr); } if (!result) { if (errno == EINVAL) fputs ("\nfatal: too many args for xstrconcat\n", stderr); else fputs ("\nfatal: out of memory\n", stderr); exit (2); } return result; }