obt/ddfile.c (raw)
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/* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*- obt/ddfile.c for the Openbox window manager Copyright (c) 2009 Dana Jansens 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. See the COPYING file for a copy of the GNU General Public License. */ #include "obt/ddfile.h" #include <glib.h> #ifdef HAVE_STRING_H #include <string.h> #endif #ifdef HAVE_STDIO_H #include <stdio.h> #endif typedef void (*ObtDDParseGroupFunc)(const gchar *group, const gchar *key, const gchar *value); typedef struct _ObtDDParseGroup { gchar *name; gboolean seen; ObtDDParseGroupFunc func; } ObtDDParseGroup; typedef struct _ObtDDParse { gchar *filename; gulong lineno; ObtDDParseGroup *group; GHashTable *group_hash; } ObtDDParse; typedef enum { DATA_STRING, DATA_LOCALESTRING, DATA_BOOLEAN, DATA_NUMERIC, NUM_DATA_TYPES } ObtDDDataType; struct _ObtDDFile { guint ref; ObtDDFileType type; gchar *name; /*!< Specific name for the object (eg Firefox) */ gchar *generic; /*!< Generic name for the object (eg Web Browser) */ gchar *comment; /*!< Comment/description to display for the object */ gchar *icon; /*!< Name/path for an icon for the object */ union _ObtDDFileData { struct { gchar *exec; /*!< Executable to run for the app */ gchar *wdir; /*!< Working dir to run the app in */ gboolean term; /*!< Run the app in a terminal or not */ ObtDDFileAppOpen open; /* XXX gchar**? or something better, a mime struct.. maybe glib has something i can use. */ gchar **mime; /*!< Mime types the app can open */ ObtDDFileAppStartup startup; gchar *startup_wmclass; } app; struct { gchar *url; } link; struct { } dir; } d; }; static void group_free(ObtDDParseGroup *g) { g_free(g->name); g_slice_free(ObtDDParseGroup, g); } /* Displays a warning message including the file name and line number, and sets the boolean @error to true if it points to a non-NULL address. */ static void parse_error(const gchar *m, const ObtDDParse *const parse, gboolean *error) { if (!parse->filename) g_warning("%s at line %lu of input", m, parse->lineno); else g_warning("%s at line %lu of file %s", m, parse->lineno, parse->filename); if (error) *error = TRUE; } /* reads an input string, strips out invalid stuff, and parses backslash-stuff */ static gchar* parse_string(const gchar *in, gboolean locale, const ObtDDParse *const parse, gboolean *error) { const gint bytes = strlen(in); gboolean backslash; gchar *out, *o; const gchar *end, *i; g_return_val_if_fail(in != NULL, NULL); if (!locale) { end = in + bytes; for (i = in; i < end; ++i) { if ((guchar)*i > 126 || (guchar)*i < 32) { /* non-control character ascii */ end = i; parse_error("Invalid bytes in string", parse, error); break; } } } else if (!g_utf8_validate(in, bytes, &end)) parse_error("Invalid bytes in localestring", parse, error); out = g_new(char, bytes + 1); i = in; o = out; backslash = FALSE; while (i < end) { const gchar *next = locale ? g_utf8_find_next_char(i, end) : i+1; if (backslash) { switch(*i) { case 's': *o++ = ' '; break; case 'n': *o++ = '\n'; break; case 't': *o++ = '\t'; break; case 'r': *o++ = '\r'; break; case '\\': *o++ = '\\'; break; default: parse_error((locale ? "Invalid escape sequence in localestring" : "Invalid escape sequence in string"), parse, error); } backslash = FALSE; } else if (*i == '\\') backslash = TRUE; else if ((guchar)*i >= 127 || (guchar)*i < 32) { /* avoid ascii control characters */ parse_error("Found control character in string", parse, error); break; } else { memcpy(o, i, next-i); o += next-i; } i = next; } *o = '\0'; return o; } static gboolean parse_bool(const gchar *in, const ObtDDParse *const parse, gboolean *error) { if (strcmp(in, "true") == 0) return TRUE; else if (strcmp(in, "false") != 0) parse_error("Invalid boolean value", parse, error); return FALSE; } static float parse_numeric(const gchar *in, const ObtDDParse *const parse, gboolean *error) { float out = 0; if (sscanf(in, "%f", &out) == 0) parse_error("Invalid numeric value", parse, error); return out; } gboolean parse_file_line(FILE *f, gchar **buf, gulong *size, gulong *read, ObtDDParse *parse, gboolean *error) { const gulong BUFMUL = 80; size_t ret; gulong i, null; if (*size == 0) { g_assert(*read == 0); *size = BUFMUL; *buf = g_new(char, *size); } /* remove everything up to a null zero already in the buffer and shift the rest to the front */ null = *size; for (i = 0; i < *read; ++i) { if (null < *size) (*buf)[i-null-1] = (*buf)[i]; else if ((*buf)[i] == '\0') null = i; } if (null < *size) *read -= null + 1; /* is there already a newline in the buffer? */ for (i = 0; i < *read; ++i) if ((*buf)[i] == '\n') { /* turn it into a null zero and done */ (*buf)[i] = '\0'; return TRUE; } /* we need to read some more to find a newline */ while (TRUE) { gulong eol; gchar *newread; newread = *buf + *read; ret = fread(newread, sizeof(char), *size-*read, f); if (ret < *size - *read && !feof(f)) { parse_error("Error reading", parse, error); return FALSE; } *read += ret; /* strip out null zeros in the input and look for an endofline */ null = 0; eol = *size; for (i = newread-*buf; i < *read; ++i) { if (null > 0) (*buf)[i] = (*buf)[i+null]; if ((*buf)[i] == '\0') { ++null; --(*read); --i; /* try again */ } else if ((*buf)[i] == '\n' && eol == *size) { eol = i; /* turn it into a null zero */ (*buf)[i] = '\0'; } } if (eol != *size) /* found an endofline, done */ break; else if (feof(f) && *read < *size) { /* found the endoffile, done (if there is space) */ if (*read > 0) { /* stick a null zero on if there is test on the last line */ (*buf)[(*read)++] = '\0'; } break; } else { /* read more */ size += BUFMUL; *buf = g_renew(char, *buf, *size); } } return *read > 0; } static void parse_group(const gchar *buf, gulong len, ObtDDParse *parse, gboolean *error) { ObtDDParseGroup *g; gchar *group; gulong i; /* get the group name */ group = g_strndup(buf+1, len-2); for (i = 0; i < len-2; ++i) if ((guchar)group[i] < 32 || (guchar)group[i] >= 127) { /* valid ASCII only */ parse_error("Invalid character found", parse, NULL); group[i] = '\0'; /* stopping before this character */ break; } /* make sure it's a new group */ g = g_hash_table_lookup(parse->group_hash, group); if (g && g->seen) { parse_error("Duplicate group found", parse, error); g_free(group); return; } /* if it's the first group, make sure it's named Desktop Entry */ else if (!parse->group && strcmp(group, "Desktop Entry") != 0) { parse_error("Incorrect group found, " "expected [Desktop Entry]", parse, error); g_free(group); return; } else { if (!g) { g = g_slice_new(ObtDDParseGroup); g->name = group; g->func = NULL; g_hash_table_insert(parse->group_hash, group, g); } else g_free(group); g->seen = TRUE; parse->group = g; g_print("Found group %s\n", g->name); } } static gboolean parse_file(ObtDDFile *dd, FILE *f, ObtDDParse *parse) { gchar *buf = NULL; gulong bytes = 0, read = 0; gboolean error = FALSE; while (!error && parse_file_line(f, &buf, &bytes, &read, parse, &error)) { /* XXX use the string in buf */ gulong len = strlen(buf); if (buf[0] == '#' || buf[0] == '\0') ; /* ignore comment lines */ else if (buf[0] == '[' && buf[len-1] == ']') parse_group(buf, len, parse, &error); ++parse->lineno; } if (buf) g_free(buf); return !error; } ObtDDFile* obt_ddfile_new_from_file(const gchar *name, GSList *paths) { ObtDDFile *dd; ObtDDParse parse; GSList *it; FILE *f; dd = g_slice_new(ObtDDFile); dd->ref = 1; parse.filename = NULL; parse.lineno = 0; parse.group = NULL; /* hashtable keys are group names, value is a ObtDDParseGroup */ parse.group_hash = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, (GDestroyNotify)group_free); f = NULL; for (it = paths; it && !f; it = g_slist_next(it)) { gchar *path = g_strdup_printf("%s/%s", (char*)it->data, name); if ((f = fopen(path, "r"))) { parse.filename = path; parse.lineno = 1; if (!parse_file(dd, f, &parse)) f = NULL; } } if (!f) { obt_ddfile_unref(dd); dd = NULL; } g_hash_table_destroy(parse.group_hash); return dd; } void obt_ddfile_ref(ObtDDFile *dd) { ++dd->ref; } void obt_ddfile_unref(ObtDDFile *dd) { if (--dd->ref < 1) { g_slice_free(ObtDDFile, dd); } } |