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+/*
+ * $Id$
+ *
+ * Copyright (c) 1994, 1995. Netscape Communications Corporation. All
+ * rights reserved.
+ *
+ * Use of this software is governed by the terms of the license agreement for
+ * the Netscape Communications or Netscape Comemrce Server between the
+ * parties.
+ */
+
+
+/* ------------------------------------------------------------------------ */
+
+
+/*
+ * util.h: A hodge podge of utility functions and standard functions which
+ * are unavailable on certain systems
+ *
+ * Rob McCool
+ */
+
+
+#ifndef HTTPD_UTIL_H
+#define HTTPD_UTIL_H
+
+#include "buffer.h" /* filebuf for getline */
+
+#include <time.h> /* struct tm */
+
+
+/* ------------------------------ Prototypes ------------------------------ */
+
+
+/*
+ * getline scans in buf until it finds a LF or CRLF, storing the string in
+ * l. It will terminate the string and return:
+ *
+ * 0 when done, with the scanned line (minus CR or LF) in l
+ * 1 upon EOF, with the scanned line (minus CR or LF) in l
+ * -1 on error with the error description in l (uses lineno for information)
+ */
+
+int util_getline(filebuf *buf, int lineno, int maxlen, char *l);
+
+
+/*
+ * can_exec returns 1 if you can execute the file described by finfo, and
+ * 0 if you can't.
+ */
+
+#ifdef XP_UNIX
+#include <sys/stat.h>
+#include <sys/types.h>
+
+int util_can_exec(struct stat *finfo, uid_t uid, gid_t gid);
+
+#endif /* XP_UNIX */
+/*
+ * env_create creates a new environment with the given env, with n new
+ * entries, and places the current position that you should add your
+ * entries with at pos.
+ *
+ * If env is NULL, it will allocate a new one. If not, it will reallocate
+ * that one.
+ */
+
+char **util_env_create(char **env, int n, int *pos);
+
+/*
+ * util_env_str allocates a string from the given name and value and
+ * returns it. It does not check for things like = signs in name.
+ */
+
+char *util_env_str(char *name, char *value);
+
+/*
+ * env_replace replaces the occurrence of the given variable with the
+ * value you give.
+ */
+
+void util_env_replace(char **env, char *name, char *value);
+
+/*
+ * util_env_free frees an environment.
+ */
+
+void util_env_free(char **env);
+
+/*
+ * util_env_find looks through env for the named string. Returns the
+ * corresponding value if the named string is found, or NULL if not.
+ */
+char *util_env_find(char **env, char *name);
+
+
+/*
+ * hostname gets the local hostname. Returns NULL if it can't find a FQDN.
+ * You are free to realloc or free this string.
+ */
+
+char *util_hostname(void);
+
+
+/*
+ * chdir2path changes the current directory to the one that the file
+ * path is in. path should point to a file. Caveat: path must be a writable
+ * string. It won't get modified permanently.
+ */
+
+int util_chdir2path(char *path);
+
+/*
+ * is_mozilla checks if the given user-agent is mozilla, of at least
+ * the given major and minor revisions. These are strings to avoid
+ * ambiguities like 1.56 > 1.5
+ */
+
+int util_is_mozilla(char *ua, char *major, char *minor);
+
+/*
+ * is_url will return 1 if the given string seems to be a URL, or will
+ * return 0 otherwise.
+ *
+ * Because of stupid news URLs, this will return 1 if the string has
+ * all alphabetic characters up to the first colon and will not check for
+ * the double slash.
+ */
+
+int util_is_url(char *url);
+
+/*
+ * util_later_than checks the date in the string ims, and if that date is
+ * later than or equal to the one in the tm struct lms, then it returns 1.
+ *
+ * Handles RFC 822, 850, and ctime formats.
+ */
+
+int util_later_than(struct tm *lms, char *ims);
+
+
+/*
+ * util_uri_is_evil returns 1 if a URL has ../ or // in it.
+ */
+int util_uri_is_evil(char *t);
+
+/*
+ * util_uri_parse gets rid of /../, /./, and //.
+ *
+ * Assumes that either the string starts with a /, or the string will
+ * not .. right off of its beginning. As such, ../foo.gif will
+ * not be changed, although /../foo.gif will become /foo.gif.
+ */
+
+void util_uri_parse(char *uri);
+
+/*
+ * util_uri_unescape unescapes the given URI in place (% conversions only).
+ */
+
+void util_uri_unescape(char *s);
+
+/*
+ * util_uri_escape escapes any nasty chars in s and copies the string into d.
+ * If d is NULL, it will allocate and return a properly sized string.
+ * Warning: does not check bounds on a given d.
+ *
+ * util_url_escape does the same thing but does it for a url, i.e. ?:+ is
+ * not escaped.
+ */
+
+char *util_uri_escape(char *d, char *s);
+char *util_url_escape(char *d, char *s);
+
+/*
+ * util_sh_escape places a \ in front of any shell-special characters.
+ * Returns a newly-allocated copy of the string.
+ */
+
+char *util_sh_escape(char *s);
+
+/*
+ * util_itoa converts the given integer to a string into a.
+ */
+
+int util_itoa(int i, char *a);
+
+/*
+ * util_vsprintf and util_sprintf are simplified clones of the System V
+ * vsprintf and sprintf routines.
+ *
+ * Returns the number of characters printed. Only handles %d and %s,
+ * does not handle any width or precision.
+ */
+
+#include <stdarg.h>
+
+int util_vsprintf(char *s, register char *fmt, va_list args);
+int util_sprintf(char *s, char *fmt, ...);
+
+/* These routines perform bounds checks. */
+int util_vsnprintf(char *s, int n, register char *fmt, va_list args);
+int util_snprintf(char *s, int n, char *fmt, ...);
+
+#endif