gets, gets_s

 

C

Lenguaje

Encabezados

Soporte de tipos

Utilidades del programa

Funciones variádicas

Gestión de errores

Gestión de memoria dinámica

Utilidades de fecha y hora

Biblioteca de cadenas de caracteres

Algoritmos

Números

Soporte de entrada/salida

Soporte de localización

Operaciones atómicas(C11)

Soporte de procesos(C11)

Especificaciones Técnicas

 

File input/output

Funciones Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Acceso a archivos Original: File access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
fopen freopen fclose fflush	fwide setbuf setvbuf
Directo de entrada / salida Original: Direct input/output The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
fread
fwrite
Entrada sin formato / salida Original: Unformatted input/output The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
fgetc fgets fputc fputs getchar gets putchar puts ungetc	fgetwc fgetws fputwc fputws getwchar putwchar ungetwc
Formato de entrada / salida Original: Formatted input/output The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
scanffscanfsscanf vscanfvfscanfvsscanf (C99)(C99)(C99) printffprintfsprintfsnprintf (C99) vprintfvfprintfvsprintfvsnprintf (C99)	wscanffwscanfswscanf vwscanfvfwscanfvswscanf (C99)(C99)(C99) wprintffwprintfswprintf vwprintfvfwprintfvswprintf
Presentar posicionamiento Original: File positioning The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ftell
fgetpos
fseek
fsetpos
rewind
Gestión de errores Original: Error handling The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
clearerr
feof
ferror
perror
Las operaciones en los archivos Original: Operations on files The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
remove
rename
tmpfile
tmpnam

 

Definido en el archivo de encabezado <stdio.h>
char*gets(char*str );		(hasta C11)
char*gets_s(char*str, rsize_t n);		(desde C11)(opcional)

1)

Lee stdin en la cadena de caracteres apuntada por str hasta que un carácter de nueva línea se encuentra o se produce al final de su archivo. A

Original:

Reads stdin into the character array pointed to by str until a newline character is found or end-of-file occurs. A

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carácter nulo es escrito inmediatamente después del último carácter leído en el array .

Original:

null character is written immediately after the last character read into the array.

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2)

Lee en la mayoría de los personajes de n-1stdin en el array apuntado por str hasta que la nueva línea de carácter, la condición de fin de archivo o error de lectura. Un carácter nulo es escrito inmediatamente después del último carácter leído en la matriz, o si no hay caracteres str[0] se leyeron .

Original:

Reads at most n-1 characters from stdin into the array pointed to by str until new-line character, end-of-file condition, or read error. A null character is written immediately after the last character read into the array, or to str[0] if no characters were read.

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@ @ Si n es cero o es mayor que RSIZE_MAX, un carácter nulo se escribe en str[0] pero la función lee y descarta los caracteres de stdin hasta que la nueva línea de carácter, la condición de fin de archivo o error de lectura .

Original:

@@ If n is zero or is greater than RSIZE_MAX, a null character is written to str[0] but the function reads and discards characters from stdin until new-line character, end-of-file condition, or read error.

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@ @ Si los caracteres n-1 han sido leídos, continúa leyendo y descartando los personajes de stdin hasta la nueva línea de carácter, la condición de fin de archivo o error de lectura .

Original:

@@ If n-1 characters have been read, continues reading and discarding the characters from stdin until new-line character, end-of-file condition, or read error.

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@ @ La función gets_s es una extensión y es opcional. Está garantizado para estar presente sólo si se define __STDC_LIB_EXT1__ .

Original:

@@ The gets_s function is an extension and is optional. It is guaranteed to be present only if __STDC_LIB_EXT1__ is defined.

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Parámetros

str

-

cadena de caracteres a ser escrito Original: character string to be written The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valor de retorno

str en caso de éxito, NULL lo contrario

Original:

str on success, NULL otherwise

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Notas

La función gets() no realiza una comprobación de límites, por lo que esta función es extremadamente vulnerable a los ataques de desbordamiento de búfer. No se puede utilizar de forma segura (a menos que el programa se ejecuta en un entorno que limita lo que puede aparecer en stdin). Por esta razón, la función está desfasada y en la tercera corrección de la norma C99 y eliminado por completo en el estándar C11. fgets() y gets_s() son los reemplazos recomendadas .

Original:

The gets() function does not perform bounds checking, therefore this function is extremely vulnerable to buffer-overflow attacks. It cannot be used safely (unless the program runs in an environment which restricts what can appear on stdin). For this reason, the function has been deprecated in the third corrigendum to the C99 standard and removed altogether in the C11 standard. fgets() and gets_s() are the recommended replacements.

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Nunca gets() usar .

Original:

Never use gets().

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Ver también

scanffscanfsscanf	lee la entrada con formato desde stdin, una secuencia de archivo o un tampón Original: reads formatted input from stdin, a file stream or a buffer The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función)
fgets	recibe una cadena de caracteres a partir de una secuencia de archivo Original: gets a character string from a file stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función)
fputs	escribe una cadena de caracteres en una secuencia de archivo Original: writes a character string to a file stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función)
Documentación de C++ para gets