dynamic strings
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3d94694017
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243
src/dstring.c
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243
src/dstring.c
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/*
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Copyright 2017-2023 Ian Jauslin
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "dstring.h"
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#include <stdarg.h>
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#include <stdlib.h>
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// init
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int dstring_init (dstring* str, unsigned int memory){
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str->string=calloc(memory,sizeof(char));
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str->memory=memory;
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str->length=0;
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return(0);
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}
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int dstring_free (dstring str){
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free(str.string);
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return(0);
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}
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// resize memory
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int dstring_resize (dstring* str, unsigned int newsize){
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unsigned int i;
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dstring new_str;
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dstring_init (&new_str, newsize);
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for(i=0;i<str->length;i++){
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new_str.string[i]=str->string[i];
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}
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new_str.length=str->length;
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free(str->string);
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*str=new_str;
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return(0);
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}
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// add a character
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int dstring_append (char val, dstring* output){
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if(output->length >= output->memory){
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dstring_resize (output,2*output->memory+1);
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}
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output->string[output->length]=val;
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output->length++;
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return(0);
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}
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// copy
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int dstring_cpy (dstring input, dstring* output){
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dstring_init (output, input.length);
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dstring_cpy_noinit (input, output);
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return(0);
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}
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// do not init output str
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int dstring_cpy_noinit (dstring input, dstring* output){
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unsigned int i;
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if(output->memory<input.length){
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fprintf(stderr,"error: cannot copy a dstring of length %u to a dstring with memory %u\n",input.length,output->memory);
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return(-1);
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}
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for(i=0;i<input.length;i++){
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output->string[i]=input.string[i];
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}
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output->length=input.length;
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return(0);
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}
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// concatenate
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int dstring_concat (dstring input, dstring* output){
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unsigned int i;
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for(i=0;i<input.length;i++){
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dstring_append (input.string[i], output);
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}
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return(0);
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}
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// sub-str
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int dstring_substr (dstring str, unsigned int begin, unsigned int end, dstring* substr){
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unsigned int i;
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if(begin>end || end>=str.length){
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fprintf(stderr,"error: cannot take substring [%u,%u] of dstring of lengdth %u\n",begin,end,str.length);
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return(-1);
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}
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dstring_init (substr,end-begin);
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for(i=begin;i<=end;i++){
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dstring_append (str.string[i], substr);
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}
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return(0);
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}
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// find
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int dstring_find (char val, dstring str){
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unsigned int i;
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for(i=0;i<str.length;i++){
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if(str.string[i]==val){
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return(i);
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}
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}
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return(-1);
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}
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// compare strings
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int dstring_cmp (dstring str1, dstring str2){
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unsigned int i;
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// compare lengths
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if(str1.length<str2.length){
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return(-1);
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}
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if(str1.length>str2.length){
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return(1);
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}
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// compare terms
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for(i=0;i<str1.length;i++){
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if(str1.string[i]<str2.string[i]){
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return(-1);
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}
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if(str1.string[i]<str2.string[i]){
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return(1);
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}
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}
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// if equal
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return(0);
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}
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// print str
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int dstring_print (dstring str, FILE* file){
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unsigned int i;
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for(i=0;i<str.length;i++){
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fprintf(file, "%s",str.string);
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}
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return(0);
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}
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// append a char*
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int dstring_append_str(char* str, dstring* output){
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char* ptr;
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for (ptr=str;*ptr!='\0';ptr++){
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dstring_append(*ptr, output);
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}
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return(0);
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}
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// convert to char*
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int dstring_to_str(dstring input, char** output){
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unsigned int i;
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(*output)=calloc(input.length+1,sizeof(char));
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for(i=0;i<input.length;i++){
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(*output)[i]=input.string[i];
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}
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if((*output)[input.length-1]!='\0'){
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(*output)[input.length]='\0';
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}
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return(0);
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}
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// noinit (changes the size of input if needed)
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char* dstring_to_str_noinit(dstring* input){
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if(input->string[input->length-1]!='\0'){
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if(input->length==input->memory){
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dstring_resize(input,input->length+1);
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}
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// add final '\0'
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input->string[input->length]='\0';
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}
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return(input->string);
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}
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// convert from char*
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int str_to_dstring(char* str, dstring* output){
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char* ptr;
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unsigned int str_len=0;
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for(ptr=str;*ptr!='\0';ptr++){
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str_len++;
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}
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dstring_init(output, str_len);
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for(ptr=str;*ptr!='\0';ptr++){
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dstring_append(*ptr,output);
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}
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return(0);
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}
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// compare a dstring and a char*
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int dstring_cmp_str(dstring dstring, char* str){
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unsigned int j;
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for(j=0;j<dstring.length && str[j]!='\0';j++){
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if(dstring.string[j]!=str[j]){
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return(0);
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}
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}
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if(j==dstring.length && str[j]=='\0'){
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return(1);
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}
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return(0);
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}
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// format strings
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int dstring_snprintf(dstring* output, char* fmt, ...){
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size_t size=100;
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unsigned int extra_size;
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char* out_str=calloc(size,sizeof(char));
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char* ptr;
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va_list vaptr;
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// initialize argument list starting after fmt
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va_start(vaptr, fmt);
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// print format
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extra_size=vsnprintf(out_str, size, fmt, vaptr);
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va_end(vaptr);
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// if too large
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if(extra_size>size){
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// resize
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free(out_str);
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// +1 for '\0'
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size=extra_size+1;
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out_str=calloc(size,sizeof(char));
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// read format again
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va_start(vaptr, fmt);
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vsnprintf(out_str,size,fmt,vaptr);
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va_end(vaptr);
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}
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// write to char array
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for(ptr=out_str;*ptr!='\0';ptr++){
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dstring_append(*ptr, output);
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}
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free(out_str);
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return(0);
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}
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76
src/dstring.h
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76
src/dstring.h
Normal file
@ -0,0 +1,76 @@
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/*
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Copyright 2017-2023 Ian Jauslin
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef DSTRING_H
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#define DSTRING_H
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#include <stdio.h>
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typedef struct dstring {
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char* string;
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unsigned int length;
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unsigned int memory;
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} dstring;
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// init
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int dstring_init (dstring* str, unsigned int memory);
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int dstring_free (dstring str);
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// resize memory
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int dstring_resize (dstring* str, unsigned int newsize);
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// add a character
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int dstring_append (char val, dstring* output);
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// copy
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int dstring_cpy (dstring input, dstring* output);
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// do not init output str
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int dstring_cpy_noinit (dstring input, dstring* output);
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// concatenate
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int dstring_concat (dstring input, dstring* output);
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// sub-str
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int dstring_substr (dstring str, unsigned int begin, unsigned int end, dstring* substr);
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// find
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int dstring_find (char val, dstring str);
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// compare strings
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int dstring_cmp (dstring str1, dstring str2);
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// print str
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int dstring_print (dstring str, FILE* file);
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// append a char*
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int dstring_append_str(char* str, dstring* output);
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// convert to char*
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int dstring_to_str(dstring input, char** output);
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// noinit (changes the size of input if needed)
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char* dstring_to_str_noinit(dstring* input);
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// convert from char*
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int str_to_dstring(char* str, dstring* output);
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// compare a dstring and a char*
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int dstring_cmp_str(dstring dstring, char* str);
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// format strings
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int dstring_snprintf(dstring* output, char* fmt, ...);
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#endif
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