strstr

strstr valgrind error

由 北慕城南 提交于 2019-12-20 07:18:33
问题 I need some help with char* initialization and strstr in C. This is the general issue: I have a function func1 func1() func2(); The issue is that valgrind gives an error basically saying that strstr might be using an uninitialized value. To rectify this, I'd have to do something like char* str = "hello world"; , but then I can't realloc , which is an issue. I have tested my program with random strings and the issue is the fact that valgrind is treating str as uninitialized, but I just don't

strstr char array inside struct array

由 被刻印的时光 ゝ 提交于 2019-12-13 18:05:25
问题 I have a struct defined as; struct player { int no, age; char name[20]; } players[10]; Array is filled from file. What I try to do is, take input from user, add input to char array, send it to search(char lookup[]) function and strstr name field in a loop. EDİT: Sorry I corrected the order. I'm trying to strstr in a loop. char *p = strstr(players[x].name, inputFromUser); but p is always null. How can I do this? Thanks in advance. EDIT - Code Added... #include <stdio.h> #include <stdlib.h>

Cutting ' \0' from strings [closed]

由 天涯浪子 提交于 2019-12-13 10:10:46
问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 4 years ago . I have a 2D array of strings loaded with getline from stdin example : Hi my name is John. I like chocolate. Then i want to search if entered string / substring matches with one of the string arrays example : Ohn. - matches at line 1 chocolate. - matches at line 2 I'm using standart function strstr

Efficient way to split a vector of a full name in to 2 separate vectors

由 て烟熏妆下的殇ゞ 提交于 2019-12-12 10:57:16
问题 I have a vector consisting of full names with the first and last name separated by a comma this is what the first few elements look like: > head(val.vec) [1] "Aabye,ֲ Edgar" "Aaltonen,ֲ Arvo" "Aaltonen,ֲ Paavo" [4] "Aalvik Grimsb,ֲ Kari" "Aamodt,ֲ Kjetil Andr" "Aamodt,ֲ Ragnhild I am looking for a way to split them in to 2 separate columns of first and last name. My final intention is to have both of them as a part of a bigger data frame. I tried using strsplit function like this names<

PHP: How to find the beginning and end of a substring in a string?

由 耗尽温柔 提交于 2019-12-12 01:18:45
问题 This is the content of one mysql table field: Flash LEDs: 0.5W LED lamps: 5mm Low Powers: 0.06W, 0.2W Remarks(1): this is remark1 ---------- Accessories: Light Engine Lifestyle Lights: Ambion, Crane Fun Office Lights: OL-Deluxe Series Street Lights: Dolphin Retrofits: SL-10A, SL-60A Remarks(2): this is remark2 ---------- Infrared Receiver Module: High Data Rate Short Burst Optical Sensors: Ambient Light Sensor, Proximity Sensor, RGB Color Sensor Photo Coupler: Transistor Remarks(3): this is

strstr cannot find substring but buffer contains the value [closed]

由 这一生的挚爱 提交于 2019-12-11 18:34:19
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . I was trying UART using STM32F407V6T6 and CubeMx . My UART is working fine. The problem I'm getting while comparing the buffer: I am using strstr() to check that my buffer contains valid substring or not. Here is the code: uint8_t buff[10]; int main(void) { HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX

strstr() equivalent in C#

由 旧城冷巷雨未停 提交于 2019-12-10 17:54:37
问题 I have two byte[] and I want to find the first occurrence of the second byte[] in the first byte[] (or a range in it). I don't want to use strings for efficiency (translating the first byte[] to a string will be inefficient). Basically I believe that's what strstr() does in C. What is the best way to do that (so it be efficient and easy to use)? This is how it should look like: int GetOffsetOfArrayInArray(byte[] bigArray, int bigArrayOffset, int bigArrayCount, byte[] smallArray); Thanks!

C 简陋版string操作strcpy strcmp strcat strchr strstr

由 空扰寡人 提交于 2019-12-09 11:39:02
文件下载地址： http://pan.baidu.com/s/1bn2BcTL 代码如下： #include <stdio.h> #include <stdlib.h> char *strcpy_(char *dest,const char *src); char *strcat_(char *dest,const char *src); int strcmp_(const char *dest,const char *src); int strlen_(const char *src); char *strchr_(char *s, int c); char *strstr_(const char *s,const char *c); int main() { char p[]="xxdexxx"; char q[]="de"; printf("p=%s\n",p); printf("q=%s\n",q); printf("strlen_(p)=%d\n",strlen_(p)); printf("strcpy_(p,q)=%s\n", strcpy_(p,q)); char p1[]="xxdexxx"; char q1[]="de"; printf("strchr_(p,'d')=%s\n",strchr_(p1,'d')); char p2[]="xxdexxx";

Agner Fog's strstr() vs g++ built-in strstr() performance

由 不想你离开。 提交于 2019-12-09 03:45:24
问题 I attempted to compare the built-in strstr() in g++ (g++ (Debian 7.2.0-19) with the assembly implementation in Agner Fog's asmlib (http://www.agner.org/optimize/asmlib.zip). The target CPU is core-i3 supporting sse4x and avx. To compile: g++ -O2 -msse4 main.cpp libaelf64.a (you would need the static library is from the asmlib distribution). Functions rdtsc64_start(), rdtsc64_end() to measure performance follow intel's white paper (https://www.intel.com/content/dam/www/public/us/en/documents

Using strstr inside a switch php

由 為{幸葍}努か 提交于 2019-12-07 04:45:01
问题 I just cannot think of the code. I have waay too many if statments which I want to change to be a switch statement, but I cannot find of the logic. At the moment I have: if(strstr($var,'texttosearch')) echo 'string contains texttosearch'; if(strstr($var,'texttosearch1')) echo 'string contains texttosearch1'; if(strstr($var,'texttosearch2')) echo 'string contains texttosearc2h'; //etc etc... But how can I achieve the same within a switch? 回答1: switch (true) { case strstr($var,'texttosearch'):
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