Home/ Questions/Stabilizing the error with the best answers: __isoc99_sscanf@plt
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Rebecca Williams
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Asked: 2022-05-18T20:41:17+00:00 In:

Stabilizing the error with the best answers: __isoc99_sscanf@plt

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For the problem “__isoc99_sscanf@plt”. I tried to fix it, but It doesn’t work and returns the result I want. Here is my program:

.code32
 .file "mystery.c"
 .text
 .LCO:
 .string "Incorrect number of command line arguments given"
 .LC1:
 .string "Input:%s"
 .align 4
 .LC2:
 .string "Incorrect format for command line argument"
 .LC3:
 .string "Output: "%s"\n"
 .text
  .globl main
 .type main, @function
  main:
 pushl %ebp
 movl %esp, %ebp
 andl $-16, %esp
 subl $32, %esp
 cmpl $2, 8(%ebp)
 je .L18
 movl $.LC0, (%esp)
 call puts
 movl $1, %eax
 jmp .L19
 .L18:
 movl 12(%ebp), %eax
 addl $4, %eax
 movl (%eax), %eax
 movl %eax, (%esp)
 call strlen
 movl %eax, %edx
 movl %edx, %eax
 sall $2, %eax
 addl %edx, %eax
 movl %eax, (%esp)
 call malloc
 movl %eax, 28(%esp)
 movl $.LC1, %edx
 movl 12(%ebp), %eax
 addl $4, %eax
 movl (%eax), %eax
 movl 28(%esp), %ecx
 movl %ecx, 8(%esp)
 movl %edx, 4(%esp)
 movl %eax, (%esp)
 call __isoc99_sscanf
 cmpl $1, %eax
 je .L20
 movl $.LC2, (%esp)
 call puts
 movl $1, %eax
 jmp .L19
 
  .L20:
 movl 28(%esp), %eax
 movl %eax, (%esp)
 call foo
 movl $.LC3, %eax
 movl 28(%esp), %edx
 movl %edx, 4(%esp)
 movl %eax, (%esp)
 call printf
 movl 28(%esp), %eax
 movl %eax, (%esp)
 call free
 jmp .L17
 .L19:
 .L17:
 leave
 ret
 .size main, .-main
 .ident "GCC: (GNU) 4.4.7 20120313 (Red Hat 4.4.7-4)"
 .section .note.GNU-stack,"",@progbits

and

call __isoc99_sscanf

has occurred. I’ve checked the entire command line but still can’t find the mistake.

isoc99_sscanf
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2 Answers

  1. This is what I believe helps: 

     man scanf:

 These functions return the number of input items successfully matched
 and assigned, which can be fewer than provided for, or even zero in the
 event of an early matching failure.
    • 12

  2. In essence, it returns the total quantity of inputs that you have recently entered into the computer. It would set percent rax to 2 if you entered two digits in the field 1 4.
    These routines give the number of input items back that were matched and assigned successully; this number may be less than what was anticipated or even 0 in the event that an early matching attempt failed.

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