[英]How to copy specific contents of a file onto another file in C?
我已經花了幾個小時了,我覺得我沒有掌握C的一些基本技術。我一直試圖在特定的行中讀取並將其存儲在一個文件的2個單獨的文件中。 源文件(temp)是我正在讀取的文件,而2個文件,數據和文本是我要存儲的2個文件。
TL; DR,如何將文件中的內容分成兩個單獨的文件?
例如,輸入文件為:
.data
A: .word 32
B: .word 16
.text
main:
la $s0 A
lw $s0 0($s0)
la $s1 B
lw $s1 0($s1)
此函數將接收臨時文件,並將.data和.text段處理為單獨的文件。
void process_file(FILE * temp)
{
FILE * data, * text;
char * token;
char * nextLine;
char line[256];
char * str_token = malloc(256 * sizeof(char));
char * str = malloc(256 * sizeof(char));
int i;
data = fopen("data.asm", "w");
text = fopen("text.asm", "w");
if (temp == NULL || data == NULL || text == NULL)
{
printf("UNABLE TO OPEN OR LOCATE FILES. EXITING.\n");
exit(1);
}
while (!feof(temp))
{
if ((nextLine = fgets(line, 256, temp)) != NULL)
{
token = strtok(nextLine, "\n");
//printf("%s", nextLine);
if (token != NULL)
{
strcat(str_token, token);
token = strtok(NULL, "\n");
if ((strstr(str_token, ".data")) != NULL)
{
strcat(str, str_token);
fprintf(data, "%s", str); //ADDING THIS CAUSES A SEG FAULT :(
}
else if ((strstr(token, ".text")) != NULL)
{
fprintf(text, "%s", token);
token = strtok(NULL, "\n");
}
}
}
}
}
謝謝!
void process_file(FILE *temp){
FILE *data, *text, *fp;
char line[256], str[256];
char *token;
data = fopen("data.asm", "w");
text = fopen("text.asm", "w");
if (temp == NULL || data == NULL || text == NULL) {
printf("UNABLE TO OPEN OR LOCATE FILES. EXITING.\n");
exit(1);
}
fp = data;//default for not start with .data and .text
while(fgets(line, sizeof line, temp)){
strcpy(str, line);
if((token=strtok(str, " \t\n"))!=NULL){//not blank line
if(strcmp(token, ".data")==0)
fp = data;
else if(strcmp(token, ".text")==0)
fp = text;
}
fprintf(fp, "%s", line);
}
fclose(data);
fclose(text);
}
這就是我用來獲得答案的方法,使用您提供的代碼
void process_file(FILE * temp)
{
//You may use NULL versus 0
FILE * data = 0, * text = 0;
char * token = 0;
char * nextLine = 0;
char line[256];
int i = 0;
data = fopen("data.asm", "w");
text = fopen("text.asm", "w");
if ( 0 == temp || 0 == data || 0 == text )
{
printf("UNABLE TO OPEN OR LOCATE FILES. EXITING.\n");
exit(1);
}
while (!feof(temp))
{
if ((nextLine = fgets(line, 256, temp)) != NULL)
{
token = strtok(nextLine, "\n");
//printf("%s", nextLine);
if (0 != token){
if(strcmp(token, ".data") == 0 ){
//Make use of that i
i = 1;
}
else if(strcmp(token, ".text") == 0){
i = 2;
}
switch(i){
case 1:
fprintf(data, "%s\r\n", token);
break;
case 2:
fprintf(text, "%s\r\n", token);
break;
default:
printf("Invalid!");
break;
}
}
}
}
fclose(data);
fclose(text);
fclose(temp);
}
#include <string.h>
#include <stdio.h>
void process_file(FILE * temp)
{
FILE * data, * text, *write = NULL;
char * token;
char * nextLine;
char line[256];
char * str_token = malloc(256 * sizeof(char));
char * str = malloc(256 * sizeof(char));
char val [] = "safasfsdf";
int i;
data = fopen("data.asm", "w");
text = fopen("text.asm", "w");
if (temp == NULL || data == NULL || text == NULL)
{
printf("UNABLE TO OPEN OR LOCATE FILES. EXITING.\n");
exit(1);
}
while (!feof(temp))
{
if ((nextLine = fgets(line, 256, temp)) != NULL)
{
if ((strstr(line, ".data")) != NULL)
{
write = data;
}
else if ((strstr(line, ".text")) != NULL)
{
write = text;
}
if(line[0]!= '\n'){
printf ("%p %s",write, line);
fprintf(write, "%s", line);
}
}
}
fclose (data);
fclose (text);
}
模式首先被識別。 基於模式文件指針被選擇。 我從原始來源中刪除了一些多余的行,並使其變得簡單。 希望這對您有幫助。
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