fgets

How to read a file line-by-line in C?

由 江枫思渺然 提交于 2019-12-29 08:19:17
问题 I have a text file with up to 100 IP addresses, 1 per line. I need to read each address, as a string, into an array called "list". First, I'm assuming that "list" will need to be a two-dimensional char array. Each IP address is 11 characters in length, 12 if you include '\0', so I declared list as follows: char list[100][12]; Next, I attempt to use fgets to read the stream: for (i = 0; i < 100; i++) { if (feof(stream)) break; for (j = 0; j < 12; j++) fgets(&list[i][j], 12, stream); count++; }

How do I eliminate line break from fgets function in PHP?

由 99封情书 提交于 2019-12-28 20:32:41
问题 I am attempting to make a gallery that calls the image names from a flat file database using the PHP 'fgets' function. There are different sections in the gallery, each with it's own default image, and a small list of images that the users can select from. Everything is working fine, except for one button. I have one button on the page that is supposed to reset all the galleries to their default images using Javascript OnClick. It works exactly as I want it to, with one small hitch: It copies

Using fgets() and strtok() to read in a file line-by-line in C?

由 不打扰是莪最后的温柔 提交于 2019-12-28 13:58:26
问题 I'm trying to use fgets and strtok() to read in a file line by line, and create a linked list of each different line of information. Right now, I'm only just putting the information into an array, just to try to figure out how to read the information in correctly, but it's not working right. In the while(fgets) portion, it seems to load everything into the array properly, and prints it out. However, after that loop has executed and I try to print out the whole array, I get really weird

fgetc, fgets, getc, getchar, gets, ungetc - 输入字符和字符串

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-28 13:05:31
总览 (SYNOPSIS) #include <stdio.h> int fgetc(FILE *stream); char *fgets(char *s, int size, FILE *stream); int getc(FILE *stream); int getchar(void); char *gets(char *s); int ungetc(int c, FILE *stream); 描述 (DESCRIPTION) fgetc() 从 stream 流 中 读取 下一个 字符, 然后 从 unsigned char 类型转换 到 int 型 返回, 如果 到达 文件末尾 或 出现 错误 则 返回 EOF . getc() 等于 fgetc() , 只是 它 可能 以 宏 的 形式 实现, 并 多次 访问 stream 流. getchar() 等于 getc( stdin ) . gets() 从 stdin 读取 一行 字符串, 保存在 s 指向的 缓冲区 中, 读到 换行符(newline) 或 EOF 时 操作 结束, 同时 把 它们 替换为 '\0' . 该函数 不检查 缓冲区溢出 (参见 后面的 BUGS 节). fgets() 从 stream 流 中 读取 多至 size - 1 个 字符, 保存在 s 指向的 缓冲区 中, 读到 换行符

Reading from file using fgets

由 岁酱吖の 提交于 2019-12-28 04:19:05
问题 I am reading from file of format 1 32 43 23 32 43 123 43 54 243 123 2222 2 Here is my code snippet. string[100]; while(!feof(fp)) fgets(string,100,fp) Now, when I put every string, in the last string I am getting repetition and some more ambiguities (like something else also gets printed say 123 or so). How to solve this problem? 回答1: You need to check the return value of fgets. If a read has been successful, fgets returns the pointer to the buffer that you passed to it (i.e. string in your

C-fopen,fwrite,fread,fseek,fgets,popen,access笔记

由 丶灬走出姿态 提交于 2019-12-27 14:58:36
FILE * fopen(const char * path,const char * mode); 所需库： <stdio.h> 返回值 FILE是C语言定义的标准数据结构,如果open()失败,则返回NULL path 路径 mode 打开模式,包括有以下几种 r 以只读方式打开文件，该文件必须存在。 r+ 以读/写方式打开文件，该文件必须存在。 rb+ 以读/写方式打开一个二进制文件，只允许读/写数据。 rt+ 以读/写方式打开一个文本文件，允许读和写。 w 打开只写文件，若文件存在则长度清为 0，即该文件内容消失，若不存在则创建该文件。 w+ 打开可读/写文件，若文件存在则文件长度清为零，即该文件内容会消失。若文件不存在则建立该文件。 a 以附加的方式打开只写文件。若文件不存在，则会建立该文件，如果文件存在，写入的数据会被加到文件尾，即文件原先的内容会被保留（EOF 符保留）。 a+ 以附加方式打开可读/写的文件。若文件不存在，则会建立该文件，如果文件存在，则写入的数据会被加到文件尾后，即文件原先的内容会被保留（原来的 EOF 符不保留）。 wb 以只写方式打开或新建一个二进制文件，只允许写数据。 wb+ 以读/写方式打开或建立一个二进制文件，允许读和写。 wt+ 以读/写方式打开或建立一个文本文件，允许读写。 at+ 以读/写方式打开一个文本文件，允许读或在文本末追加数据

Unix tail program in C using an implemented function

由 时间秒杀一切 提交于 2019-12-25 18:53:45
问题 I have implemented my own dynamic-memory version of getline function: char * fgetline(FILE * f) Starts with 30 character buffer and when the buffer is full allocate a new one copy the contents and free the old buffer. When we get EOF or \n we return from the function. I want to use this function to implement a version of the program tail. Input comes from stdin, output goes to stdout. If the first argument begins with - , everything after the - is the number of lines to print. The default

C - read line from stdin with fgets() in function

由 六眼飞鱼酱① 提交于 2019-12-25 17:26:15
问题 I'm trying to read line from stdin with fgets(), I want to use fgets() in my function, which I think is the problem. The string could be max 1024 chars long. When I run this code I get "Segmentation fault (core dumped)" #include <stdio.h> #include <stdlib.h> #include <string.h> #define MAX_SIZE 1025 void print_fgets(); int main() { print_select(); return 0; } void print_select() { char *str; int length; while (fgets( str, MAX_SIZE, stdin)!=NULL) { length=strlen(str); if (length==MAX_SIZE-1 &&

Previously stored strings are overwritten by fgets

由 泄露秘密 提交于 2019-12-25 17:16:03
问题 I'm reading records from a CSV file using fgets() to read the file one line at a time, and strtok() to parse the fields in each line. I'm encountering a problem where fgets() overwrites a string that was previously written, in favor of the new string. Here's an example of what I mean by that: record.csv (This is the file I'm reading in) John,18 Johann,29 main.c #include <stdio.h> #include <stdlib.h> #include <string.h> typedef struct customer { char *name; int age; } Customer; int main(void)

fgets and sscanf

由 冷暖自知 提交于 2019-12-25 13:43:24
问题 This code is supposed to get integers from a file which is finput and sort it and gets the first integer in the file which is the number of integers to be sorted and the integers that follow are the integers to be sorted. I don't get how fgets and sscanf work together. Can someone explain how fgets and sscanf work in this code? FILE *finput; int *array_int, c1, no_elem; char numlines[500]; fgets(numlines, 500, finput); array_int = (int *)malloc(sizeof(int)*no_elem); if ((sscanf(numlines, "%d"
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