140 lines
3.1 KiB
C++
140 lines
3.1 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014, 2015.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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util.cpp
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Utility functions.
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*******************************************************************************/
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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char* strdup_safe(const char* string)
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{
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return string ? strdup(string) : NULL;
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}
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const char* getenv_safe(const char* name, const char* def)
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{
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const char* ret = getenv(name);
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return ret ? ret : def;
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}
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bool array_add(void*** array_ptr,
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size_t* used_ptr,
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size_t* length_ptr,
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void* value)
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{
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void** array;
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memcpy(&array, array_ptr, sizeof(array)); // Strict aliasing.
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if ( *used_ptr == *length_ptr )
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{
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// TODO: Avoid overflow.
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size_t new_length = 2 * *length_ptr;
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if ( !new_length )
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new_length = 16;
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// TODO: Avoid overflow and use reallocarray.
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size_t new_size = new_length * sizeof(void*);
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void** new_array = (void**) realloc(array, new_size);
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if ( !new_array )
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return false;
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array = new_array;
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memcpy(array_ptr, &array, sizeof(array)); // Strict aliasing.
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*length_ptr = new_length;
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}
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memcpy(array + (*used_ptr)++, &value, sizeof(value)); // Strict aliasing.
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return true;
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}
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void stringbuf_begin(struct stringbuf* buf)
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{
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buf->length = 0;
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buf->allocated_size = 32;
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if ( !(buf->string = (char*) malloc(buf->allocated_size)) )
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{
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buf->allocated_size = 0;
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return;
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}
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buf->string[0] = '\0';
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}
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bool might_need_shell_quote(char c)
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{
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switch ( c )
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{
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case '|':
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case '&':
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case ';':
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case '<':
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case '>':
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case '(':
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case ')':
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case '$':
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case '`':
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case '\\':
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case '"':
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case '\'':
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case ' ':
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case '\t':
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case '*':
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case '?':
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case '[':
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case '#':
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case '~':
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case '=':
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case '%':
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return true;
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default:
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return false;
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}
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}
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void stringbuf_append_c(struct stringbuf* buf, char c)
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{
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if ( !buf->string )
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return;
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if ( buf->length + 1 == buf->allocated_size )
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{
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// TODO: Avoid overflow.
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size_t new_allocated_size = 2 * buf->allocated_size;
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char* new_string = (char*) realloc(buf->string, new_allocated_size);
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if ( !new_string )
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{
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buf->string = NULL;
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buf->length = 0;
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buf->allocated_size = 0;
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return;
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}
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buf->string = new_string;
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buf->allocated_size = new_allocated_size;
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}
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buf->string[buf->length++] = c;
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buf->string[buf->length] = '\0';
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}
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char* stringbuf_finish(struct stringbuf* buf)
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{
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if ( !buf->string )
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return NULL;
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return buf->string;
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}
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